Sipwise C5 CARRIER starts with a minimum deployment of 50.000 subscribers, requiring one chassis with two web servers, two db servers, two load balancers and two proxies. A fully deployed Sipwise C5 CARRIER for 200.000 subscribers fills the chassis up with 14 servers, containing two web servers, two db servers, two load balancers and 8 proxies.

Figure 8. Hardware setup for single chassis

The system is based on an IBM Flex Chassis taking up rack space of 10U with 14 computing nodes based on IBM x240 servers.

Figure 9. Chassis front view

All nodes are equipped equally with two hard disks in Raid-1 mode.

Figure 10. Chassis back view

The power supply is designed fully redundant in an N+N fashion with N=3, for example to feed 3 PSUs with normal power and 3 PSUs with UPS power.

Figure 11. Chassis switch module

Each chassis is equipped with two EN2092 Gigabit Ethernet switches providing 10 1GbE uplinks each. Four 10GbE uplinks are optional and need to be licensed separately if needed.

Figure 12. Scaling beyond one chassis

If Sipwise C5 CARRIER is scaled beyond 250.000 subscribers and therefore exceeds one chassis, a second chassis is put into place. This chassis provides another two web servers, two db servers, two load balancers and 8 proxies, doubling the capacity of the system.

Figure 13. Central core with local breakouts

In case of a geographically distributed system spanning across multiple countries, different regulatory requirements have to be met for signalling and media, especially when it comes to if, where and how subscriber traffic can be intercepted. Countries might have the requirement to intercept traffic in the country, so the signalling and media must be anchored to an element in the country. Also if a media stream stays within a country, it is preferred to keep the media as close to the subscribers as possible to reduce latency, so relaying streams via a central core has to be avoided.

For this scenario, Sipwise C5 CARRIER makes it possible to move the load balancers directly into the countries. DNS settings for subscribers within the country ensure that they will always contact those load balancers, either using separate DNS settings per country for a SIP domain, or using GeoIP mechanisms in DNS to return the closest load balancer based on the location of the subscriber. To anchor media to the countries, the rtpengine instances are moved from the proxies to the load balancers and are controlled via the stateless kamailio instances on the load balancers instead of the kamailio instances on the proxies.

Sipwise provides Sipwise C5 platform fully pre-installed on two Dell PowerEdge R330 servers. Their most important characteristics are:

3.2.1.2. Front View

The front view of a current Sipwise C5 Dell R330 server:

Figure 14. Dell R330 Front View

The front view of a former Sipwise C5 Dell R310…:

Figure 15. Dell R310 Front View

…and Dell R320 server:

Figure 16. Dell R320 Front View

3.2.1.3. Rear View

The rear view of a current Sipwise C5 Dell R330 server:

Figure 17. Dell R330 Rear View

The rear view of a former Sipwise C5 Dell R310…:

Figure 18. Dell R310 Rear View

…and Dell R320 server:

Figure 19. Dell R320 Rear View

3.2.1.4. Power Supply Units (PSU)

The servers are equipped with 2 redundant, hot-swappable PSUs, which are accessible from the rear side and located on the right of the chassis:

Figure 20. Redundant PSUs

The redundant PSUs include LEDs that indicate the status of the PSU:

Figure 21. PSU Indicators

1. The indicator is solidly lit green: A valid power source is connected to the PSU and the PSU is operational.

2. The indicator is flashing green: The PSU firmware is being updated.

   caution
   	Do not disconnect the power cord or unplug the PSU when updating the firmware. If a firmware update is interrupted, the PSUs will not function. You must roll back the PSU firmware by using Dell Lifecycle Controller. For more information, see Dell Lifecycle Controller User’s Guide at Dell.com/idracmanuals.

3. The indicator is flashing green and turns off: When hot-adding a PSU, the PSU handle flashes green five times at 4 Hz rate and turns off. This indicates that there is a PSU mismatch with respect to efficiency, feature set, health status, and supported voltage. Ensure that both the PSUs are the same.

4. The indicator is flashing amber: Indicates a problem with the PSU.

   caution
   	When correcting a PSU mismatch, replace only the PSU with the flashing indicator. Swapping the other PSU to make a matched pair can result in an error condition and unexpected system shutdown. To change from a High Output configuration to a Low Output configuration or vice versa, you must turn off the system.

   caution
   	AC PSUs support both 220 V and 110 V input voltages with the exception of Titanium PSUs, which support only 220 V. When two identical PSUs receive different input voltages, they can output different wattages, and trigger a mismatch.

   caution
   	If two PSUs are used, they must be of the same type and have the same maximum output power.

   caution
   	Combining AC and DC PSUs is not supported and triggers a mismatch.

5. The indicator is not lit: Power is not connected.

In order to put Sipwise C5 into operation, you need to rack-mount it into 19" racks.

You will find the following equipment in the box:

You will additionally need the following parts as they are not part of the distribution:

Install the two servers into the rack (either into a single one or into two geographically distributed ones).

The rails shipped with the servers fit into standard 4-Post 19" racks. If they do not fit, please consult your rack vendor to get proper rails.

The following figure shows the mounted rails:

Figure 22. Rack-mounted Rails

Each server has two redundant Power Supply Units (PSU). Connect one PSU to your normal power circuit and the other one to an Uninterruptible Power Supply Unit (UPS) to gain the maximum protection against power failures.

The cabling should look like in the following picture to prevent accidental power cuts:

Figure 23. Proper PSU Cabling