Block lists can either be whitelists or blacklists and are controlled by the User Preferences block_in_mode, block_out_mode and their administrative counterparts.

You can change a list mode from one to the other at any time.

The list contents are controlled by the User Preferences block_in_list, block_out_list and their administrative counterparts. Click on the Edit button in the Preferences view to define the list entries.

In block list entries, you can provide shell patterns like * and []. The behavior of the list is controlled by the block_xxx_mode feature (so they are either allowed or rejected). In our example above we have block_out_mode set to blacklist, so all calls to US numbers and to the Austrian number +431234567 are going to be rejected.

Click the Close icon once you’re done editing your list.

For incoming call, the User Preference block_in_clir and adm_block_in_clir controls whether or not to reject incoming calls with number supression (either "[Aa]nonymous" in the display- or user-part of the From-URI or a header Privacy: id is set). This flag is independent from the Block Mode.

To create an NCOS Level, go to Settings→NCOS Levels and press the Create NCOS Level button.

Select a reseller, enter a name, select the mode and add a description, then click the Save button.

To define the rules within the newly created NCOS Level, click on the Patterns button of the level.

There are 2 groups of patterns where you can define matching rules for the selected NCOS Level:

Figure 28. NCOS Patterns List

In the NCOS Number Patterns view you can create multiple patterns to define your level, one after the other. Click on the Create Pattern Entry Button on top and fill out the form.

Figure 29. Create NCOS Number Pattern

In this example, we block (since the mode of the level is blacklist) all numbers starting with 439. Click the Save button to save the entry in the level.

There are 2 options that help you to easily define specific number ranges that will be allowed or blocked, depending on whitelist / blacklist mode:

In the NCOS LNP Carriers view you can select specific LNP Carriers — i.e. carriers that host the called ported numbers — that will be allowed or blocked for routing calls to them (whitelist / blacklist mode, respectively).

Sipwise NGCP performs number matching always with the dialed number and not with the number generated after LNP lookup that is: either the original dialed number prefixed with an LNP carrier code, or the routing number.

An example of NCOS LNP Carrier pattern definition:

Figure 30. Create NCOS LNP Carrier

In the above example we created a rule that blocks calls to "LNP_Carr1" carrier, supposing we use blacklist mode of the NCOS Level.

Once you’ve defined your NCOS Levels, you can assign them to local subscribers. To do so, navigate to Settings→Subscribers, search for the subscriber you want to edit, press the Details button and go to the Preferences View. There, press the Edit button on either the ncos or adm_ncos setting in the Call Blockings section.

You can assign the NCOS level to all subscribers within a particular domain. To do so, navigate to Settings→Domains, select the domain you want to edit and click Preferences. There, press the Edit button on either ncos or admin_ncos in the Call Blockings section.

Note: if both domain and subscriber have same NCOS preference set (either ncos or adm_ncos, or both) the subscriber’s preference is used. This is done so that you can override the domain-global setting on the subscriber level.

In some countries there are regulatory requirements that prohibit subscribers from forwarding their numbers to special numbers like emergency, police etc. While the sip:carrier does not deny provisioning Call Forward to these numbers, the administrator can prevent the incoming calls from being actually forwarded to numbers defined in the NCOS list: just select the appropriate NCOS level in the domain’s or subscriber’s preference adm_cf_ncos. This NCOS will apply only to the Call Forward from the subscribers and not to the normal outgoing calls from them.

Click on Manage Destination Sets to see a list of available sets. The quickset_cfu has been implicitly created during our creation of a simple call forward. You can edit it to add more destinations, or you can create a new destination set.

When you close the Destination Set Overview, you can now assign your new set in addition or instead of the quickset_cfu set.

Press Save to store your settings.

Click on Manage Time Sets in the advanced call-forward menu to see a list of available time sets. By default there are none, so you have to create one.

You need to provide a Name, and a list of Periods where this set is active. If you only set the top setting of a date field (like the Year setting in our example above), then it’s valid for just this setting (like the full year of 2013 in our case). If you provide the bottom setting as well, it defines a period (like our Month setting, which means from beginning of April to end of September). For example, if a CF is set with the following timeset: "hour { 10-12 } minute { 20-30 }", the CF will be matched within the following time ranges:

If you close the Time Sets management, you can assign your new time set to the call forwards you’re configuring.

Once the Advanced View of the call forward definition has been opened, you will need to press the Manage Source Sets button to start defining new Source Sets or managing an existing one. The following image shows the Source Set definition dialog:

Figure 31. Creating a Call Forward Source Set

You will need to fill in the Name field first, then in Source field you can enter:

You can add more patterns to the Source Set by pressing the Add another source button. When you finished adding all patterns, press the Save button. You will then see the below depicted list of Source Sets:

Figure 32. List of Call Forward Source Sets

As a next step you can define a Destination Set as described in Destination Sets Section 5.3.2.1, “Configuring Destination Sets” subchapter. For our example, we have defined the following Destination Set:

Figure 33. List of Call Forward Destination Sets

A final step of defining the call forward settings is selecting a Destination, a Time and a Source Set, as shown in the image below. Please note that there is no specific Time Set selected in our example, that means the call forward rule is valid (as shown) <always>.

Figure 34. Definition of a Call Forward with Source and Destination Sets

Once all the settings have been defined and the changes are saved, you will see the call forward entry (in our example: Call Forward Unconditional), with the names of the selected Destination, Time and Source Sets provided, at Subscriber Preferences → Call Forwards location on the web interface:

Figure 35. List of Call Forward with Source and Destination Sets

LNP Carriers are defined by an arbitrary Name for proper identification (e.g. British Telecom) and contain a Prefix which can be used as routing prefix in LNP Rewrite Rules and subsequently in Peering Rules to route calls to the proper carriers. The LNP prefix is written to CDRs to identify the selected carrier for post processing and analytics purposes of CDRs. LNP Carrier entries also have an Authoritative flag indicating that the numbers in this block belong to the carrier operating the sip:carrier. This is useful to define your own number blocks, and in case of calls to those numbers reject the calls if the numbers are not assigned to local subscribers (otherwise they would be routed to a peer, which might cause call loops). Finally the Skip Rewrite flag skips executing of LNP Rewrite Rules if no number manipulation is desired for an LNP carrier.

LNP Carriers contain one or more LNP Numbers. Those LNP Numbers are defined by a Number entry in E164 format (<cc><ac><sn>) used to match a number against the LNP database. Number matching is performed on a longest match, so you can define number blocks without specifying the full subscriber number (e.g. a called party number 431999123 is going to match an entry 431999 in the LNP Numbers).

For an LNP Numbers entry, an optional Routing Number can be defined. This is useful to translate e.g. premium 900 or toll-free 800 numbers to actual routing numbers. If a Routing Number is defined, the called party number is implicitly replaced by the Routing Number and the call processing is continued with the latter. For external billing purposes, the optional Type tag of a matched LNP number is recorded in CDRs.

An optional Start Date and End Date allows to schedule porting work-flows up-front by populating the LNP database with certain dates, and the entries are only going to become active with those dates. Empty values for start indicate a start date in the past, while empty values for end indicate an end time in the future during processing of a call, allowing to define infinite date ranges. As intervals can overlap, the LNP number record with a start time closest to the current time is selected.

In order to activate Local LNP during routing, the feature must be activated in config.yml. Set kamailio→proxy→lnp→enabled to yes and kamailio→proxy→lnp→type to local.

Calls to non-authoritative Carriers

When a call arrives at the system, the calling and called party numbers are first normalized using the Inbound Rewrite Rules for Caller and Inbound Rewrite Rules for Callee within the rewrite rule set assigned to the calling party (a local subscriber or a peer).

If the called party number is not assigned to a local subscriber, or if the called party is a local subscriber and has the subscriber/domain preference lnp_for_local_sub set, the LNP lookup logic is engaged, otherwise the call proceeds without LNP lookup. The further steps assume that LNP is engaged.

If the call originated from a peer, and the peer preference caller_lnp_lookup is set for this peer, then an LNP lookup is performed using the normalized calling party number. The purpose for that is to find the LNP prefix of the calling peer, which is then stored as source_lnp_prefix in the CDR, together with the selected LNP number’s type tag (source_lnp_type). If the LNP lookup does not return a result (e.g. the calling party number is not populated in the local LNP database), but the peer preference default_lnp_prefix is set for the originating peer, then the value of this preference is stored in source_lnp_prefix of the CDR.

Next, an LNP lookup is performed using the normalized called party number. If no number is found (using a longest match), no further manipulation is performed.

If an LNP number entry is found, and the Routing Number is set, the called party number is replaced by the routing number. Also, if the Authoritative flag is set in the corresponding LNP Carrier, and the called party number is not assigned to a local subscriber, the call is rejected. This ensures that numbers allocated to the system but not assigned to subscribers are dropped instead of routed to a peer.

Next, if the the LNP carrier does not have the Skip Rewriting option set, the LNP Rewrite Rules for Callee are engaged. The rewrite rule set used is the one assigned to the originating peer or subscriber/domain via the rewrite_rule_set preference. The variables available in the match and replace part are, beside the standard variables for rewrite rules:

Typically, you would create a rewrite rule to prefix the called party number with the callee_lnp_prefix by matching ^([0-9]+)$ and replacing it by ${callee_lnp_prefix}\1.

Once the LNP processing is completed, the system checks for further preferences to finalize the number manipulation. If the originating local subscriber or peer has the preference lnp_add_npdi set, the Request URI user-part is suffixed with ;npdi. Next, if the preference lnp_to_rn is set, the Request URI user-part is suffixed with ;rn=LNP_ROUTING_NUMBER, where LNP_ROUTING_NUMBER is the Routing Number stored for the number entry in the LNP database, and the originally called number is kept in place. For example, if lnp_to_rn is set and the number 1800123 is called, and this number has a routing number 1555123 in the LNP database, the resulting Request-URI is sip:1800123;rn=1555123@example.org.

Finally, the destination_lnp_prefix in the CDR table is populated either by the prefix defined in the Carrier of the LNP database if a match was found, or by the default_lnp_prefix prefrence of the destination peer or subscriber/domain.

The Sipwise NGCP provides means to allow or block calls towards ported numbers that are hosted by particular LNP carriers. Please visit Section 5.2.2.2, “Creating Rules per NCOS Level” in the handbook to learn how this can be achieved.

If a call originated from a peer and the peer preference force_outbound_calls_to_peer is set to force_nonlocal_lnp (the if callee is not local and is ported selection in the panel), the call is routed back to a peer selected via the peering rules.

This ensures that if a number once belonged to your system and is ported out, but other carriers are still sending calls to you (e.g. selecting you as an anchor network), the affected calls can be routed to the carrier the number got ported to.

The LNP database can be exported to CSV, and in the same format imported back to the system. On import, you can decide whether to drop existing data prior to applying the data from the CSV.

The CSV file format contains the fields in the following order:

carrier_name carrier_prefix number routing_number start end authoritative skip_rewrite

In order to activate LNP lookup via API during call routing, the feature must be activated in /etc/ngcp-config/config.yml. Set these parameters:

There is a possibility to explicitly allow (whitelist) or deny (blacklist) certain number ranges for which an LNP lookup may be done. The relevant configuration parameters are at kamailio→proxy→lnp→lnp_request_whitelist and kamailio→proxy→lnp→lnp_request_blacklist. For each entry in the list a POSIX regex expression may be used, see the following example:

    lnp:
      lnp_request_whitelist:
        - '^9'
        - '^800'
      lnp_request_blacklist:
        - '^1'
        - '^900'
        - '^110'
        - '^112'

Interpretation of the above lists (that are based on numbers represented in national format):

It is possible to set up LNP daemon to provide a kind of redundant service to the Proxy. This means the LNP daemon will send its LNP query to more LNP serving nodes that are predefined in a list. (See Configuration of LNP daemon Section 5.4.2.3, “Configuration of Sipwise LNP Daemon” chapter for details.) The LNP query may happen in 2 ways:

LNP daemon takes its active configuration from /etc/ngcp-lnpd/config.yml file. The file is generated automatically — when a new NGCP configuration is applied (ngcpcfg apply…) — from the main Sipwise NGCP configuration file: /etc/ngcp-config/config.yml and a template: /etc/ngcp-config/template/etc/ngcp-lnpd/config.yml.tt2. System administrators are only expected to modify the lnpd.config section of main configuration file /etc/ngcp-config/config.yml.

A sample LNP daemon configuration file (/etc/ngcp-lnpd/config.yml) looks like:

daemon:
        json-rpc:
                ports:
                        - 54321
                        - 12345
                interfaces:
                        - 127.0.0.1
                        - 192.168.1.90
                        - ::1

        sip:
                port: 5095
                address: 0.0.0.0

        threads: 4
        foreground: false
        pidfile: /tmp/lnpd.pid
        loglevel: 7

instances:
        default:
                module: sigtran
                destination: 192.168.1.99
                from-domain: test.example.com
                headers:
                        - header: INAP-Service-Key
                          value: 2
                reply:
                        tcap: raw-tcap
        redundant:
                module: sigtran
                destinations:
                        - 192.168.1.99
                        - 192.168.1.95
                        - 192.168.1.90
                mechanism: round-robin
                retry-time: 30
                timeout: 5
                from-domain: test.example.com
                headers:
                        - header: INAP-Service-Key
                          value: 2
                reply:
                        tcap: raw-tcap
        parallel:
                module: sigtran
                destinations:
                        - 192.168.1.99
                        - 192.168.1.95
                        - 192.168.1.90
                mechanism: parallel
                retry-time: 30
                timeout: 10
                from-domain: test.example.com
                headers:
                        - header: INAP-Service-Key
                          value: 2
                reply:
                        tcap: raw-tcap
        mock1:
                module: mock-tcap
                numbers:
                        - number: '4311003'
                          routing-number: '4318881003'
                reply:
                        tcap: raw-tcap

The corresponding NGCP main configuration file contains:

    daemon:
      foreground: 'false'
      json-rpc:
        ports:
          - '54321'
          - '12345'
      loglevel: '7'
      sip:
        port: '5095'
      threads: '4'
    instances:
    << These are the same entries as in /etc/ngcp-lnpd/config.yml file >>

Description of configuration parameters in /etc/ngcp-config/config.yml file

There is a special case when the dialed number is recognized as an emergency number, but the emergency number is not available for the geographic area the calling party is located in.

In such a case the emergency mapping lookup will return an emergency prefix, but the value of this will be NULL. Therefore the call is rejected and an announcement is played. The announcement is a newly defined sound file referred as emergency_geo_unavailable.

It is possible to configure the rejection code and reason in /etc/ngcp-config/config.yml file, the parameters are: kamailio.proxy.early_rejects.emergency_invalid.announce_code and kamailio.proxy.early_rejects.emergency_invalid.announce_reason.

The Sipwise NGCP offers the possibility to upload / download emergency mapping entries in form of CSV files. This operation is available for each reseller, and is very useful if a reseller has many mapping entries.

Downloading Emergency Mapping List

One has to navigate to Settings → Emergency Mapping menu and then press the Download CSV button to get the list of mapping entries in a CSV file. First the reseller must be selected, then the Download button must be pressed. As an example, the entries shown in "Emergency Mapping List" picture above would be written in the file like here below:

EmergCont_1,133,E1_133_
EmergCont_1,144,E1_144_
EmergCont_2,133,E2_133_

The CSV file has a plain text format, each line representing a mapping entry, and contains the following fields:

Uploading Emergency Mapping List

Uploading a CSV file with emergency mapping entries may be started after pressing the Upload CSV button. The following data must be provided:

Figure 41. Uploading Emergency Mapping Data

The CSV file for the upload has the same format as the one used for download.

The SIP PBX by default inherits the domain dialplan which usually has rewrite rules applied to normal Class 5 subscribers with inbound rewrite rules normalizing the dialed number to the E.164 standard. If most users of this domain are Class 5 subscribers the dialplan may supply calling number in national format - see Section 4.7, “Configuring Rewrite Rule Sets”. While the SIP-PBX trunk configuration can be sometimes amended it is a good idea in sense of SIPconnect recommendation to send only the global E.164 numbers.

Moreover, in mixed environments with the sip:carrier Cloud PBX sharing the same domain with SIP trunking (SIP-PBX) customers the subscribers may have different rewrite rules sets assigned to them. The difference is caused by the fact that the dialplan for Cloud PBX is fundamentally different from the dialplan for SIP trunks due to extension dialing, where the Cloud PBX subscribers use the break-out code (see Section 16.1.2, “Preparing PBX Rewrite Rules”) to dial numbers outside of this PBX.

The SIPconnect compliant numbering plan can be accommodated by assigning Rewrite Rules Set to the SIP-PBX subscriber. Below is a sample Rewrite Rule Set for using the global E.164 numbers with plus required for the calling and called number format compliant to the recommendation.

Assign the aforementioned Rewrite Rule Set to the SIP-PBX subscribers.

The following configuration is needed for your platform to populate the From and To headers and Request-URI of the INVITE request with "user=phone" parameter as per RFC 3261 Section 19.1.1 (if the user part of the URI contains telephone number formatted as a telephone-subscriber).

The following is our common configuration that covers the calling number presentation in a variety of use-cases, including the incoming calls, on-net calls and Call Forward by the platform:

The above parameters can be tuned to operator specifics as required. You can of course override these settings in the Subscriber Preferences if particular subscribers need special settings.

Externally forwarded call. If the call forward takes place inside the SIP-PBX it can use one of the following specification for signaling the diversion number to the platform:

If a SIP-PBX cannot perform the digest authentication, you can authenticate it by its source IP address in sip:carrier. To configure the IP-based authentication, go to the subscriber’s preferences (Details→ Preferences→Trusted Sources) and specify the IP address of the SIP-PBX in the Source IP field.

To authenticate multiple subscribers from the same IP address, use theFrom field to distinguish these subscribers.

When this feature is configured for a subscriber, the sip:carrier authenticates all calls that arrive from the specified IP address without challenging them.

The parameters of peer probing are found in the main system configuration file /etc/ngcp-config/config.yml. You can see the complete list of configuration parameters in Section 1.16, “kamailio” of the handbook, while the most significant ones are discussed here.

Enabling peer probing system-wide happens through the kamailio.proxy.peer_probe.enable parameter. If it is set to yes (which is the default value) then NGCP will consider probing of individual peering servers based on their settings.

Timeout of a single probing request can be defined through kamailio.proxy.peer_probe.timeout parameter. This is a value interpreted as seconds while NGCP will wait for a SIP response from the peering server. Default is 5 seconds.

The probing interval can be set through the kamailio.proxy.peer_probe.interval parameter. This is the time period in seconds that determines how often a probing request is sent to the peering servers. Default is 10 seconds.

The SIP method used for probing requests can be defined through kamailio.proxy.peer_probe.method parameter. Allowed values are: OPTIONS (default) and INFO.

If no available peering server is found, the call is rejected with the response code and reason configured in kamailio.proxy.early_rejects.peering_unavailable.announce_code and kamailio.proxy.early_rejects.peering_unavailable.announce_reason. If a sound file is configured within the system sound set assigned to the calling party, an announcement is played as early media before the rejection.

When the peer probing feature is enabled on system-level, it is possible to add each individual peering server to the list of probed endpoints. You can change the probed status of a server in two ways:

Enable probing of a peering server via the admin web interface

Figure 50. Enable Probing of Peering Server

Enable probing of a peering server via the REST API

In all cases you have to set the probe property to true in order to enable probing, and to false in order to disable probing. Default value is false and this property may be omitted in a create/update request, which ensures backward compatibility of the /api/peeringservers API resource.

Each kamailio-proxy instance on the proxy nodes performs the probing individually for performance reasons. Each proxy holds its result in its cache to avoid central storage and replication of the probing results. Each proxy will send an SNMP trap if it detects a state change for a peering server, because proxies might be geographically distributed along with their load-balancers and can therefore experience different probing results.

Each peering server is cross-checked against the hash table filled during outbound probing requests and is skipped by call routing logic, if a match is found.

On start or restart of the kamailio-proxy instance, the probing will start after the first interval, and NOT immediately after start. In the first probing interval the proxy will always try to send call traffic to peering servers until the first probing round is finished, and will only then start to skip unavailable peering servers.

A new configuration template: /etc/ngcp/config/templates/etc/kamailio/proxy/probe.cfg.tt2 is introduced to handle outbound probing requests.

A new DB column: provisioning.voip_peer_hosts.probe with type TINYINT(1) (boolean) is added to the DB schema.

A peer status change will populate the kamailio.dispatcher table, inserting the SIP URI in format sip:$ip:$port;transport=$transport in dispatcher group 100, which defines the probing group for peering servers.

Also the kamailio.dispatcher.attrs column is populated with a parameter peerid=$id. This ID is used during probing to load the peer preferences: outbound_socket and lbrtp_set, that are required to properly route the probing request.

Since access might need to be provided from external networks like PSTN/Mobile, and since certain SIP phones do not support calling alphanumeric numbers to dial voicebox, you can map any number to the voicebox URIs using rewrite rules.

To do so, you can provision a match pattern e.g. ^(00|\+)12345$ with a replace pattern voicebox or voiceboxpass to map a number to either password-less or password-based IVR access respectively. Create a new rewrite rule with the Inbound direction and the Callee field in the corresponging rewrite rule set.

For inbound calls from external networks, assign this rewrite rule set to the corresponding incoming peer. If you also need to map numbers for on-net calls, assign the rewrite rule set to subscribers or the whole SIP domain.

When reaching voiceboxpass, the subscriber is prompted for her mailbox number and a password. All numbers assigned to a subscriber are valid input (primary number and any alias number). By default, the required format is in E.164, so the subscriber needs to enter the full number including country code, for example 4912345 if she got assigned a German number.

You can globally configure a rewrite rule in config.yml using asterisk.voicemail.normalize_match and asterisk.voicemail.normalize_replace, allowing you to customize the format a subscriber can enter, e.g. having ^0([1-9][0-9]+)$ as match part and 49$1 as replace part to accept German national format.

The standard voice mail greeting is the "unavailable" greeting. This is used if you don’t answer the phone and so the call is directed to your voice mailbox.

If you wish, you can record a custom greeting used when someone calls you and you are currently on the phone. This is called your "Busy" greeting.

You can also record a temporary greeting. If it exists, a temporary greeting will always be played instead of your "busy" or "unavailable" greetings. This could be used, for example, if you are going on vacation or will be out of the office for a while and want to inform people not to expect a return call anytime soon. Using a temporary greeting avoids having to change your normal unavailable greeting when you leave and when you come back.

When a caller leaves a message for you,the system will put the message into the "New Messages" folder. If you listen to the message, but do not delete the message or save the message to a different folder, it will automatically move the message to the "Old Messages" folder. When you first log into your mailbox, the Voicemail System will make the "New Messages" folder the current folder if you have any new messages. If you do not have any new messages the it will make the "Old Messages" folder the current folder.

In order to manage the call-through CLIs for subscriber, navigate to Settings→Subscribers, search for the subscriber you want to edit, press Details and then Preferences, scroll down to the Callthrough CLIs section and press Edit Callthrough CLIs button.

Using the NGCP Panel the user then creates Call Forward to destination Call Through.

If the subscriber has a Call Forward to the call-through application but caller’s CLI is not in the authorized CLIs list for call-through, sems responds with error back to proxy and proxy advances to the next number in the Call Forward destinations set. User can enter special destination Local Subscriber as next target after Call Through in the destinations set in order to terminate the call to the subscriber as if the subscriber didn’t exist. This way the user may reach the call-through application from his authorized CLI (e.g. mobile number) and all other callers would reach the SIP subscriber’s registered phone as usual.

In order for the Callthrough application to work a Sound Set must be created and associated with the Domain or Subscriber.

Sound Sets can be defined in Settings→Sound Sets. To create a new Sound Set, click Create Sound Set. Then click the Files button. Administrator can upload the default sounds in one of supported languages or uploaded by the administrator manually in his language of choice.

There is a preference sound_set on Domain and Subscriber levels to link subscribers to the sound set that they should hear (as usual the subscriber preference overrides the domain one).

The INVITE contains an extra SIP header P-App-Param with the following parameters:

Caller is authorized using mapping shown in table above: select source_uuid from provisioning.voip_cc_mapping where uuid=$uuid and auth_key=$srcnumber;

If the check fails return the configured error response code. Then proceed with the call setup as follows.

Sems requests the user to enter destination and starts digit collection. Digit collection process is terminated after 5 seconds (configurable in sems config file) or by pressing the # key. User can start entering destination while the voice prompt is being played.

Sems sends INVITE to the proxy with Request-URI: sip:$number@$outboundproxy;sw_domain=$subscriber.domain

From: $outgoing_cli

On receiving the 401 or 407 response from the proxy the application authenticates using the digest credentials retrieved for the call-through subscriber from the voip_subscribers table:select s.username, s.password, d.domain from provisioning.voip_subscribers s, provisioning.voip_domains d where s.uuid=$source_uuid and s.domain_id=d.id;

If the call setup fails the application plays back the "could_not_connect" sound file. If successful the application acts transparently and does not provide any voice announcements or DTMF detection.

The CLI on the outgoing call from the call-through module is set to the Network-Provided Number (NPN) of the call-through subscriber. There is nothing to configure.

In order to use the calling cards service the user creates a Call Forward to destination Calling Card for the designated subscriber that will be used as access number for this service.

In order for the Calling Card application to work a Sound Set must be created and associated with the Domain or Subscriber.

Sound Sets can be defined in Settings→Sound Sets. To create a new Sound Set, click Create Sound Set. Then click the Files button. Administrator can upload the default sounds in one of supported languages or uploaded by the administrator manually in his language of choice.

There is a preference sound_set on Domain and Subscriber levels to link subscribers to the sound set that they should hear (as usual the subscriber preference overrides the domain one).

The CLI on the outgoing call from the calling card app can be configured in one of the following ways using subscriber preferences:

1) Show original caller’s CLI: the calling card subscriber shall have allowed_clis: * (any). Sems application sends the original caller’s CLI in the From header, it is validated by the SIP proxy and sent to outside.

2) Show number of the pilot (calling card) subscriber: the calling card subscriber shall have an empty allowed_clis and desired number set as value of user_cli preference. The SIP proxy overrides the original caller’s CLI in UPN with the value of the user_cli preference. The peer must have set outbound_from_user, outbound_from_display: User-Provided Number (UPN).

The INVITE contains an extra SIP header P-App-Param with the following parameters:

Sems application plays back the available balance of the customer. Sems requests the user to enter destination and starts digit collection. Digit collection process is terminated after 5 seconds (configurable in sems config file) or by pressing the # key. User can start entering destination while the voice prompt is being played.

Sems sends INVITE to the proxy with Request-URI: sip:$number@$outboundproxy;sw_domain=$subscriber.domain

From: $outgoing_cli

On receiving the 401 or 407 response from the proxy the application authenticates using the digest credentials retrieved for the subscriber for outgoing call leg from the voip_subscribers table: select s.username, s.password, d.domain from provisioning.voip_subscribers s, provisioning.voip_domains d where s.uuid=$source_uuid and s.domain_id=d.id;

During the destination collection phase in calling card application user can enter special code *1*<pin># (configurable in sems config file) to transfer balance from other calling card customer to the currently authorized customer. Sems transfers all remaining balance from that customer to the current customer.

The call via calling card application as well as call-through generates three CDRs:

Invoice templates can be searched, created, edited and deleted in the invoice templates management interface.

Invoice template creation is separated on two steps:

To register new invoice template press "Create Invoice Template" button.

On the invoice template meta information form following parameters can be specified:

All form fields are mandatory.

After registering new invoice template you can change invoice template structure in WYSIWYG SVG editor and preview result of the invoice generation based on the template.

Invoice template is a XML SVG source, which describes content, look and position of the text lines, images or other invoice template elements. The sip:carrier provides embedded WYSIWYG SVG editor svg-edit 2.6 to customize default template. The sip:carrier svg-edit has some changes in layers management, image edit, user interface, but this basic introduction still may be useful.

Template refers to the owner reseller contact ("rescontact"), customer contract ("customer"), customer contact ("custcontact"), billing profile ("billprof"), invoice ("invoice") data as variables in the "[%%]" mark-up with detailed information accessed as field name after point e.g. [%invoice.serial%]. During invoice generation all variables or other special tokens in the "[% %]" mark-ups will be replaced by their database values.

Press on "Show variables" button on invoice template content page to see full list of variables with the fields:

You can add/change/remove embedded variables references directly in main svg-edit window. To edit text line in svg-edit main window double click on the text and place cursor on desired position in the text.

After implementation of the desired template changes, invoice template should be saved Section 5.21.2.3, “Save and preview invoice template content”.

To return to the sip:carrier invoice template default content you can press on the "Discard changes" button.

Layers

Default template contains three groups elements (<g/>), which can be thinked of as pages, or in terms of svg-edit - layers. Layers are:

To see all invoice template layers, press on "Layers" vertical sign on right side of the svg-edit interface:

Side panel with layers list will be shown.

One of the layers is active, and its element can be edited in the main svg-edit window. Currently active layer’s name is bold in the layers list. The layers may be visible or invisible. Visible layers have "eye" icon left of their names in the layers list.

To make a layer active, click on its name in the layers list. If the layer was invisible, its elements became visible on activation. Thus you can see mixed elements of some layers, then you can switch off visibility of other layers by click on their "eye" icons. It is good idea to keep visibility of the "Background" layer on, so look of the generated page will be seen.

Edit SVG XML source

Sometimes it may be convenient to edit svg source directly and svg-edit makes it possible to do it. After press on the <svg> icon in the top left corner of the svg-edit interface:

SVG XML source of the invoice template will be shown.

SVG source can be edited in place or just copy-pasted as usual text.

To save your changes in the svg xml source, first press "OK" button on the top left corner of the source page:

And then save invoice template changes Section 5.21.2.3, “Save and preview invoice template content”.

Change logo image

After image uploaded save invoice template changes Section 5.21.2.3, “Save and preview invoice template content”.

To save invoice template content changes press button "Save SVG".

You will see message about successfully saved template. You can preview your invoice look in PDF format. Press on "Preview as PDF" button.

Invoice preview will be opened in the new window.

Enabling the function requires changing the value of rtpproxy.recording.enabled parameter to “yes”. In order to make the new configuration active, it’s necessary to do:

ngcpcfg apply ‘Activated call recording’

Description of configuration parameters:

If Call Recording is enabled you can see 2 rtpengine processes running when checking the NGCP system state with monit tool:

root@sp1:/etc/ngcp-config# monit summary
...
Process 'lb'                        Running
Process 'rtpengine'                 Running
Process 'rtpengine-recording'       Running
Process 'voisniff-ng'               Running
...

Activating Call Recording for e.g. a Subscriber: please use NGCP’s admin web interface for this purpose. On the web interface one has to navigate as follows: Settings → Subscribers → select subscriber Details → Preferences → NAT and Media Flow Control. Afterwards the record_call option has to be enabled by pressing the Edit button and ticking the checkbox.

Figure 58. Activating Call Recording

It is possible to list existing call recordings of a Subscriber through the admin web interface of NGCP. In order to do so, please navigate to: Settings → Subscribers → select subscriber Details → Call Recordings

Figure 59. Listing Call Recordings

If you select an item in the list, besides the main properties such as the time of call and the SIP Call-ID, you can retrieve the details of the related call (press the Call Details button), get the list of recorded files (press the Recorded Files button) or Delete the recorded call.

When selecting Call Details you will see the most important accounting data of the call. Furthermore you can see the SIP Call Flow or the complete Call Details if you press the respective buttons.

Figure 60. Listing Call Details for a Recording

When navigating to Recorded Files of a call you will be presented with a list of files. For each file item:

Figure 61. Listing Files for a Recording

The SMS function of NGCP is disabled by default. In order to enable SMS you have to change the value of configuration parameter sms.enable to yes in the main configuration file (/etc/ngcp-config/config.yml).

The second step of configuration is related to the SMSC where NGCP will connect to. You have to set the following parameters:

Other parameters of the SMSC connection may also need to be changed from the default values, but this is specific to each deployment.

Then, as usual, you have to make the new configuration active:

$ ngcpcfg apply 'Enabled SMS'
$ ngcpcfg push all

There are a few configuration files for the Kannel module, namely:

Finally: see the description of each configuration parameter in the appendix Section 1.34, “sms”.

Any subscriber registered on NGCP can apply a call forwarding setting for short messages, referred to as "CFS" (Call Forward - SMS). If the CFS feature is enabled, he can receive the SMs on his mobile phone, for example, instead of retrieving the SMs through the REST API. This is much more convenient for users if they do not have an application on their smartphone or computer that could manage the SMs through the REST API.

In order to enable CFS you have to set the forwarding as usual on the admin web interface, or through the REST API. Navigate to Subscribers → select one → Details → Preferences → Call Forwards and press the Edit button.

Figure 63. Call Forward for SMS

On the LB node you can see a process named "bearerbox". This process has 2 listening ports assigned to it:

The monit tool also shows the bearerbox process in its status information:

$ monit summary
...
Process 'kannel-bearerbox'          Running
...

The following log files can provide information about the operation of Bearer Box:

On the PRX node you can see a process named "smsbox". This process has a listening port assigned to it: 13002, that is the communication port towards the Bearer Box component running on LB nodes.

The monit tool also shows the smsbox process in its status information:

$ monit summary
...
Process 'kannel-smsbox'             Running
...

The following log files can provide information about the operation of SMS Box: