Securing SIP Trunk

[Chuan Liu]

I have a 3845 with 2 ISDN PRA interfaces running as a PSTN gateway. Customers running various PBX systems connecting to this gateway via SIP trunks. I want certain calls from a specific customer go outof a specific PRA. I achieve this by checking 'calling-number' with the 'answer-address' command. But problems arise when the calling numbers are not presented correctly as calls will go out the wrong PRA interface. Is there a way to check both calling-number and source IP address to route the calls?

Thanks in advance.

[paolo bevilacqua · Accepted solution]

Yes, that is called carrier-based routing and is a bit complicated to configure. See:

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t11/feature/guide/ftgwrepg.html

Note, only a portion of the above document is applicable to your case.

Hope this helps, please rate post if it does!

[Chuan Liu]

Hi Paolo,

This looks like the document I am looking for.

Thanks a lot.