User`s manual

SIP User's Manual 434 Document #: LTRT-83303
Mediant 1000 & Mediant 600
4. In the ‘FXO Settings’ page (refer to ''Configuring the FXO Parameters'' on page 248),
set the parameter ‘Dialing Mode’ to ‘Two Stages’ (IsTwoStageDial = 1).
7.13.5 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 implementing SIP trunking
between an Enterprise's PBX and two Internet Telephony Service Providers (ITSP), using
AudioCodes device.
Scenario: In this example, the Enterprise wishes to connect its TDM PBX to two different
ITSPs, by implementing a 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 are to 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 the example setup:
Figure 7-16: Example Setup for Routing Between ITSP and Enterprise PBX