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HOLD/DTMF out-of-band compatibility issue

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When configured DMTF via RTP/SIP INFO, pressing HOLD GXV-3000 sends INVITE/SDP or (200 OK when terminating the HOLD) containing a=fmtp headers. This leads to interoperability problems with certain SIP servers./T.

targa

valid for GXV-3000 1.1.3.29