User`s manual

H.323 User's Manual 8. Telephony Capabilities
Version 5.0 273 December 2006
8.13 Configuration Examples
8.13.1 Trunk-to-Trunk Routing Example
This example describes two Mediant 1000 gateways, each interfacing with the PSTN
through four E1 spans. Gateway ‘A’ is configured to route all incoming TelÆIP calls to
gateway ‘B’. Gateway ‘B’ generates calls to PSTN on the same E1 Trunk as the call was
originally received (in gateway ‘A’).
 Gateway ‘A’ IP address: 192.168.3.50
 Gateway ‘B’ IP address: 192.168.3.51
The Ini file parameters configuration for gateways ‘A’ and ‘B’ include the following:
1. Define, for both gateways, four trunk groups, each with 30 B-channels:
• TrunkGroup_1 = 0/1-31,1000
• TrunkGroup_2 = 1/1-31,2000
• TrunkGroup_3 = 2/1-31,3000
• TrunkGroup_4 = 3/1-31,4000
2. In gateway ‘A’, add the originating Trunk Group ID as a prefix to the destination
number for TelÆIP calls:
AddTrunkGroupAsPrefix = 1
3. In gateway ‘A’, route all incoming PSTN calls, starting with the prefixes 1, 2, 3, and 4,
to gateway’s ‘B’ IP address:
• Prefix = 1, 192.168.3.51
• Prefix = 2, 192.168.3.51
• Prefix = 3, 192.168.3.51
• Prefix = 4, 192.168.3.51
Note: It is also possible to define Prefix = *,192.168.3.51 instead of the four lines
above.
4. In gateway ‘B’, route IPÆPSTN calls to Trunk Group ID according to the first digit of
the called number:
• PSTNPrefix = 1,1
• PSTNPrefix = 2,2
• PSTNPrefix = 3,4
• PSTNPrefix = 4,4
5. In gateway ‘B’, remove the first digit from each IPÆPSTN number before it is used in
an outgoing call:
NumberMapIP2Tel = *,1