Symptom: When using mgcp dtmf-relay type nte-gw, a sniffer trace will reveal that digits are sent both in-band (within the audio stream) and out-of-band (dtmf-relay). Because of this, double digits can be seen in Unity and MeetingPlace.
Conditions: GW with PRI/CAS backhaul via MGCP to CUCM and mgcp dtmf-relay configured to use nte-gw.
Workaround: Use mgcp dtmf-relay type out-of-band.
I saw any MGCP NTFY message in a capture packet from GW, I used the workaround (Use mgcp dtmf-relay type out-of-band.) and the dtmf duplicated issue was fixed!
Like I need to use dtmf RFC2833 to Other IVR, then I think that need to force a dtmf rfc2833 only (not permit OOB dtmf) in the IVR Genesys or change the IOS in the GW to fix the bug....or perhaps there are other recomendation?
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