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CCM 4.1.3 SIP Trunk to MCI IP Advantage

Has anyone successfully configured a SIP trunk from CCM 4.1.3 to MCI/Verizon's IP Advantage VoIP offering? I would like to know if there's any specific challenges I need to be aware of before going down this road.

MCI is telling me that they require an MTP to be used for the SIP trunk and that they only support 711 for the codec. We would like to run 729 even if we need DSPs to do transcoding, but MCI doesn't seem to support this due to the DTMF limitations of RFC 2833 NTE/NSE.

Does anyone have any insight on this configuration.

Thanks in advance.

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