Version 7.0 493 Mediant 3000
User's Manual 24. Manipulation
24.8.4 Reason Header
The device supports the SIP Reason header according to RFC 3326. The Reason header
describes the disconnection cause of a call:
Sending Reason header: If a call is disconnected from the Tel side (ISDN), the
Reason header contains the value of the received Q.850 cause in the appropriate
message (BYE/CANCEL/final failure response) and sent to the IP side. If the call is
disconnected because of a SIP reason, the Reason header is set to the appropriate
SIP response.
Receiving Reason header: If a call is disconnected from the IP side and the SIP
message includes the Reason header, it is sent to the Tel side according to the
following logic:
• If the Reason header includes a Q.850 cause, it is sent as is.
• If the Reason header includes a SIP response:
♦ If the message is a final response, the response status code is translated to
Q.850 format and passed to ISDN.
♦ If the message isn’t a final response, it is translated to a Q.850 cause.
• When the Reason header is received twice (i.e., SIP Reason and Q.850), the
Q.850 takes precedence over the SIP reason and is sent to the Tel side.
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