01-28-2011 12:53 AM - edited 03-16-2019 03:08 AM
Hi All ,
I’m trying to use a feature commonly known as 2 B channel Transfer (TBCT) or Release Link Trunk. Nortel/ Avaya call this feature Anti-Tromboning .
Firstly let me explain what i am trying to do. As you can see from the attached topology , i will configure a AA in Unity Connection. The calls initiated from CS1000 hits the Unity Connection and the caller hears the prompt, dials a CS1000 extension. Right after the call is transferred to corresponding CS1000 extension the call is established.
The problem is every call requires 2 ports , and the ports are busy during the call duration. ( although Unity Connection ( 8.0.3 ) is configured as “ release to switch” , the ports are not released. )
The implementation is simple ;
interface Serial0/1/1:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5 ( tbct is supported only with net5 or ni )
isdn incoming-voice voice
isdn supp-service tbct
isdn bind-l3 ccm-manager
no cdp enableand
i enabled the TRMB ( Anti-Tromboling ) on the Avaya/Nortel Cs1000 side. But i get attached error message from the ISDN trace.
Any suggestions or any other methods that i can accomplish to do this .
Solved! Go to Solution.
02-01-2011 08:59 AM
Hi, CUCM supports path replacement that would allow you to accomplish with your goals, but it only works with QSIG. Here is more information about the Path Replacement: http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/a08procl.html#wp1156114 I hope this helps. Marcos
02-01-2011 08:59 AM
Hi, CUCM supports path replacement that would allow you to accomplish with your goals, but it only works with QSIG. Here is more information about the Path Replacement: http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/admin/8_5_1/ccmsys/a08procl.html#wp1156114 I hope this helps. Marcos
02-02-2011 02:02 PM
Hi Marcos ,
Thanks for your help. It is correct.
For those who are facing similar problems , here is a useful link.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/pbx/interop/notes/532642nt.pdf
Kursat
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