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Chuan Liu
Beginner

Securing SIP Trunk

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.

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Accepted Solutions
paolo bevilacqua
Hall of Fame Master

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!

View solution in original post

2 REPLIES 2
paolo bevilacqua
Hall of Fame Master

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!

View solution in original post

Hi Paolo,

This looks like the document I am looking for.

Thanks a lot.