I can´t help, but i have a similar problem with 7960 via QSIG to a Siemens Hicom300E. When i call to the PBX i see only the text "Ring Out" but i can´t hear a ring-back tone. Via PSTN to Hicom i hear a ring-back on the IP Phone. I work with CCM 3.0(9), 3640 with ISDN BRI S/T and IOS 12.1.5(T). My config for the BRI is:
Unfortunately, it is working as expected. The IOS gateway is not able to play any tones once the DSP is already in a connected state. There was a fix put into CallManager so that when a transfer happens that it will tell the IOS gateway to play a tone to the PSTN side, but the IOS gateway fix to implement this is not yet completed. No word yet on when this will be available.
The long term fix for CallManager and IOS gateways in this scenario is for both to implement the H.450 Call Transfer feature, but that will take some time.
Note: the problem you describe does not happen with Skinny-based (and I believe MGCP-based) gateways, only with H.323 gateways such as IOS-based Cisco routers.
I had the same problem and it has been fixed. Don't know if you are still having it. It requires an upgrade to callmanager 3.0(10) and also an IOS upgrade to the gateway you are running. I am running the h.323 gateway on a 3661. Hope this helps. I would advise you to call TAC for assistance on the specific IOS for you gateway
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