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Q.850 causes

Q.850 cause 65: Bearer capability not implemented

Bearer capability not implemented: the call type (codec or media) is not supported. In SIP it usually maps to 488.

65
Q.850 name
Bearer capability not implemented
Group
Service unavailable
FreeSWITCH
BEARERCAPABILITY_NOTIMPL
Asterisk
HANGUPCAUSE=65
SIP response from a gateway
488 Not Acceptable Here
In SIP
Reason: Q.850;cause=65

Why it happens

What to check