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T38 Fax support on CCM5 SIP Trunks

I have a 3rd party voicemail that will accept voice/fax calls connected to a SIP trunk on CCM5. My gateway is a different SIP trunk on CCM5. Inbound calls that are CFNA to vm work just fine. The problem is the T38 fax. I can't get the fax to pickup - does anyone know what is needed to get CM5 to allow T38 faxes to come in one SIP trunk and out another SIP trunk? FYI - I know the gateway/vm setup is fine - if a change the dial-peer target to the IP of the vm server, T38 works prefectly. Any ideas?

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Re: T38 Fax support on CCM5 SIP Trunks

It seems like the SoftSwitch does switching t.38 by sending/receiving invite SDP with both audio and data mline which CCM does NOT support.

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