Version 6.4 357 March 2012
SIP User's Manual 18. GW and IP to IP
18.8.5 SIP Trunking between Enterprise and ITSPs
By implementing the device's enhanced and flexible routing capabilities, you can design
complex routing schemes. This section provides an example of an elaborate routing
scheme for SIP trunking between an Enterprise's PBX and two Internet Telephony Service
Providers (ITSP), using the device.
Scenario: In this example, the Enterprise wishes to connect its TDM PBX to two different
ITSPs, by implementing the device in its network environment. It's main objective is for the
device to route Tel-to-IP calls to these ITSPs according to a dial plan. The device is to
register (on behalf of the PBX) to each ITSP, which implements two servers for redundancy
and load balancing. The Register messages must use different URI's in the From, To, and
Contact headers per ITSP. In addition, all calls dialed from the Enterprise PBX with prefix
'02' is sent to the local PSTN. The figure below illustrates this example setup:
To configure call routing between an Enterprise and two ITSPs:
1. Enable the device to register to a Proxy/Registrar server using the parameter
IsRegisterNeeded.
2. In the Proxy Sets Table page (see 'Configuring Proxy Sets Table' on page 200),
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