Version 5.8 475 October 2009
SIP User's Manual 9. IP Telephony Capabilities
Define IP-to-IP call routing rules in the 'IP2IP Routing' table as follows:
• IP Phones IP Group #1 (USER) to IP PBX IP Group #2 (SERVER).
• IP Phones IP Group #1 (USER) to IP Phones IP Group #1 (USER). This is the
main alternative route if the IP PBX does not respond, whereby the user is
searched for in the device's users registration database.
• IP Phones IP Group #1 (USER) to the device (for routing to the PSTN). This is the
secondary alternative route if the user is not located in the device's user
registration database.
• IP PBX IP Group #2 (SERVER) to IP Phones IP Group #1 (USER).
Define regular gateway settings (e.g., the Trunk Group connected to the PSTN, IP-to-
Tel and Tel-to-IP routing - refer to ''SIP Trunking between Enterprise and ITSPs'' on
page 533).
Figure 9-23: Survivability Example Setup
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