We have 2 T1's coming into a voice gw. One is connected to telco via a pri for outbound calls. The other is connected to a IVR system via a T1 Cas e&m. The IVR is setup of to send faxes out and a dialpeer is setup to send these faxes to the PRI. Non Fax calls work fine for transfer..but Fax calls fail. I have noticed that on a transfer call the codec is negotiated @ g711 but the faxes have a codec of None. Is there something I am missing...these calls are non voip and a dsp is not used for the call...please advise.
I understand the hairpinning...I changed my outgoing dialpeer to a fxo port and the fax completes fine...does this lead to something on the pri...I haven't made any changes to the config other than the dial-peer choosen...
Really no config problem is evident here. You may want to give this to the TAC, before you do that you may want upgrade something recent and stable, like 12.4(16).
One more thing. Please configure:
network-clock-participate wic x/y
network-clock-select 1 T1 x/y/z
Then confirm that the IVR system can be set for external clock, and set clock internal on the corresponding router T1. Check that you are still slip-free in show controller as you are now. That would be the preferred clock configuration.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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