Version 6.2 275 February 2011
SIP User's Manual 8. IP Telephony Capabilities
8.2.8.4 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 and two Internet Telephony Service
Providers (ITSP), using AudioCodes device.
Scenario: In this example, an Enterprise has deployed the device with eight FXS
interfaces. The first four phones operate with ITSP 1 (using UDP), while the next four
phones (channels 5-8) operate with ITSP 2 (using TCP). ITSP 1 requires single registration
(i.e., one registration for all four phones), while ITSP 2 requires registration per phone.
Each ITSP implements two servers for redundancy and load balancing. The figure below
illustrates this example setup:
Figure 8-21: Routing Between ITSPs and Enterprise (Example)
¾ 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.
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