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IP phone 78xx,88xx send T38 capability vs H323 trunk

Hi,

i have just verified that in the customer infrastracture with Cisco SIP Phone the CUCM sends T38 capability in the terminalCapabilitySet vs H323 node intestead if there is a SIP trunk it'not happen.

I summarize the infrastructure:

 

SIP Phone 78xx --> CUCM 11 --> third parties H323

 

insert the signaling flow:

h323_flow.png

In the TCS highlighted the CUCM send the following capabilities:

T38.png

Can someone help me to resolve the issue?

Thanks

Daniele

1 REPLY 1

Re: IP phone 78xx,88xx send T38 capability vs H323 trunk

To my knowledge, the H.323 code base in CUCM isn’t being actively tested or maintained. I recommend moving the trunks over to SIP if possible. It will also eliminate other interop challenges such as DTMF.
Alternatively, you can try opening a TAC case against CUCM over this; however, even if they agree to open a defect I would be surprised if it ever gets fixed. Just being honest.
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