Mediant 2000 SIPMediant 2000 SIP User’s Manual 152 Document #: LTRT-725048.10 Trunk to Trunk Routing ExampleThis example describes two Mediant 2000 gateways, each interface with the PSTN through fourE1 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 is 192.168.3.50Gateway "B" IP address is 192.168.3.51Ini File Parameters of Gateways "A" and "B”:1. Define, for both gateways, four trunk groups; each with 30 B-channels:TrunkGroup_1 = 0/1-31,1000TrunkGroup_2 = 1/1-31,2000TrunkGroup_3 = 2/1-31,3000TrunkGroup_4 = 3/1-31,40002. In gateway "A”, add the originating Trunk Group ID, as a prefix, to the destination number,for TelÆIP calls:AddTrunkGroupAsPrefix=13. In gateway "A", route all incoming PSTN calls, starting with the prefixes 1, 2, 3 and 4, togateway’s "B" IP address:Prefix = 1, 192.168.3.51Prefix = 2, 192.168.3.51Prefix = 3, 192.168.3.51Prefix = 4, 192.168.3.51Note: 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 thecalled number:PSTNPrefix = 1,1PSTNPrefix = 2,2PSTNPrefix = 3,4PSTNPrefix = 4,45. In gateway "B", remove the first digit from each IPÆPSTN number, before it is used in anoutgoing call:NumberMapIP2Tel = *,1
