osmo-sip-connector does not yet support full DTMF support. The current implementation only supports DTMF tones to be send from MNCC to SIP, but not in the opposite direction. Change-Id: I578e50b0a42d88b05cf6da80443b71494b5eb26f Related: OS#2777
Ticket: OS#1684 Change-Id: I70d3014deb459e0b91a9a92c60710b994153538e