I'm curious if anyone got TBCT (Two B-Channel Transfer) feature working on H.323 IOS gateway. I see the "isdn supp-service tbct" command on the D-Channel Ser0:23 interface, but my research indicates that I must also have a TCL script to make TBCT work. I got one Cisco 2821 H.323 gateway with one PRI, one Cisco CallManager 8, one UCCX 8. The call flow:
PSTN >>(1st b-channel)>> 2821 >>> CUCM-UCCX-IVR >>> 2821 >>(2nd b-channel)>> PSTN >>(3rd b-channel)>> 2821 >>> CUCM >>> IP Phone = 3 B-channels in use
Customer calls into IVR, the call is transferred to an outside on-call service PSTN number, on-call service person picks up and eventually transfers the call to a DID extension. In some situations, that DID extension forwards to an outside PSTN cell number.
PRI switch type must be NI-2, provider would need to support TBCT, and IOS gateway would subscribe to TBCT service. In my example, when IVR blind transfers the call to the PSTN, TBCT would disconnect b-channel 1 and b-channel 2 effectively handing off the call to PSTN. At that moment the call no longer exists on the internal systems and PRI has no channels in use.
When the outside on-call service transfers the call back into DID extension, it will go to an IP Phone. If the call happens to transfer to an outside PSTN number, TBCT would again hand off the call to the PSTN provider and disconnect both b channels.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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