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Community Member

tromboning on a H323 gateway

We have a QSIG connection between a Nortel PBX 61C and a Cisco router 26XX (IOS (tm) C2600 Software (C2600-IS-M), Version 12.2(15)T11, RELEASE SOFTWARE (fc2))

When calls are setup from Nortel to Cisco a tromboning effect happens. For sone call it uses more than one channel. Sometimes even up to 10.

For example:

show isdn active

Out 22303 7557

Out 13376 3000

In 6172 13821

Out 6172 13821

In 6172 13821

In 7137 57751

Out 7137 57751

In 7137 57751

Out 7137 57751

In 7137 57751

Out 7137 57751

In 7137 57751

Out 7137 57751

In 7137 57751

Out 7137 57751

In 7137 57751

Out 7137 57751

In 7137 57751

In 9 13923

Out 9 13923

In 9 13923

Out 56718 7184

Out 13831 4153

Out 56536 7353

In 7417 13602

Out 7417 13602

In 7417 13602

Out 7417 13602

In 7417 13602

has some one any idea how to solve this problem?

3 REPLIES
Blue

Re: tromboning on a H323 gateway

You have a call routing loop. Inbound calls from the 61C are matching a dial peer that is sending them back to the 61C which routes them back.

Post your dial plan info (what DN ranges are on each side) and your dial peers. You may just need to make your POTS peer more specific.

Community Member

Re: tromboning on a H323 gateway

Thanks,

I made my POTS more specific and it worked.

old situation:

dial-peer voice 1 pots

destination-pattern ....

dial-peer voice 100 voip

destination-pattern .....

new situation:

dial-peer voice 1 pots

destination-pattern [3467]...

dial-peer voice 100 voip

destination-pattern .....

Blue

Re: tromboning on a H323 gateway

Glad that worked for you. Don't forget to use the pulldown to rate useful posts.

Dave

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