YOu may need to check below parameters between SIP signalling group on CM and switch link Administration on CMM
DTMF over IP
•
rtp-payload
if
SIP INFO for DTMF
field is set to
Ignore
on the Switch Link Admin form.
•
out-of-band
if
SIP INFO for DTMF
field is set to
Accept
on the Switch Link Admin form.
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