SIP User's Manual 534 Document #: LTRT-12801
MP-500 MSBG
9.19 SIP Trunking between Enterprise and ITSPs
By implementing the device's enhanced and flexible routing configuration capabilities using
Proxy Sets, IP Groups, and Accounts, 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 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 the example
setup:
Figure 9-43: Routing between ITSP and Enterprise PBX Example
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