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This article describes the steps necessary to configure the Sonus SBC 1000/2000

Use Case Scenario

A typical use case scenario for the Multiple IP Interface support is as follows: — also illustrated in the diagram below: 

The SBC Sonus SBC 1000/2000 is connected to both a public network and a private (Enterprise) network, acting as a Session Border Controller (SBC) which effectively hides the topologies, IP addressing, signaling attributes and policies established between these two networks from each other. Calls from one network to the other are terminated on Sonus SBC 1000/2000 (i.e. at the network border) and Sonus SBC 1000/2000 establishes a different call on the other network, and enables end-to-end conversation.

In this example, the SIP trunking provider and the Sonus SBC 1000/2000 are connected using the 10.51.100.X network. The enterprise has a IP range of 134.56.225.X. The Sonus SBC 1000/2000's main application bridge is configured to 134.56.225.202 which is the default interface and has the default IP route pointing to it. The signaling and media packets for calls to and from OCS and LAN-1 endpoints will use 134.56.225.202 as the IP address of Sonus SBC 1000/2000.

When calls are established over the SIP trunk, LAN-2 interface is used. In this case the SIP calls must use the interface IP of 10.51.100.89 for the SIP messaging, SIP source IP address and RTP source IP address. This allows Sonus SBC 1000/2000 to bridge the networks for calls and not simply route the IP packets.

The cleanest solution is to configure a single SIP Signaling Group for each network. The SIP SG pointing towards the ISP network should refer to LAN-2 interface. LAN-2 should be placed in ROUTED mode with an IP address in the 10.51.100.89/24 range. The SIP SG pointing to the Enterprise network should use the Application-IP interface, which is the default.

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SBC

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Configuration

This article assumes that a PSTN - Sonus SBC 1000/2000 - OCS 2007 R2 configuration is already in place, therefore it is unnecessary to configure Media Profiles, Media List, SIP Profiles, SIP Server Tables, Tone Table, Telephony Mapping Table in this exercise.

From the SIP Trunking with Multiple IP configuration point of view, the following items must be configured in the Sonus SBC 1000/2000:

• LAN Port 2/Ethernet 2 IP
• Translation Table
• Call Routing Table
• Signaling Group

LAN Port 2/Ethernet 2 IP

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Transformation Table

There are 4 different transformations used in this exercise:

Translation table for OCS (1xxx) extensions

Translation table for LAN-1 (2xxx) extensions

Translation table for LAN-2 (5xxx) extensions

Translation table for PSTN (3xxx) extensions

Call Routing Tables

There are 3 different Call Routing Table entries used in this exercise:

Routing Calls from OCS Endpoints

Routing Calls from Multiple IP Endpoints (LAN-1 and LAN-2 endpoints)

Routing Calls from PSTN Endpoints

Signaling Groups

Signaling Groups for OCS

Signaling Groups for LAN-1 endpoints

Signaling Groups for LAN-2 endpoints

This signaling group refers to the IP subnet used between Sonus SBC 1000/2000 and the SIP trunking provider. There are two subcases here.

If there is a NAT device between Sonus SBC 1000/2000 and the SIP-trunking peer, then NAT Traversal must be set to STATIC NAT and the public IP address of the NAT 20.40.60.89 must be specified as the Application IP. In addition, the NAT device should be configured such that it translates between the private address of 10.51.100.89 and the public address of 20.40.60.89.

If there is no NAT device between Sonus SBC 1000/2000 and the SIP-trunking peer, then NAT Traversal must be set to NONE as shown below:

Signaling Group for PSTN endpoints

Additional Configuration step for Sonus SBC SWe Lite

Adding Static IP Routes