When the B-side of the call does not respond to the IMG and T310 expires (3 Minutes)
Q.931 cause code 0x66 (Recovery from Timer expiry) or Cancel in case of SIP will be sent to the B-side of the call. Q.931 Cause code 0x13 (No answer from user) or ‘480 Temporarily Unavailable’ in case of SIP will be sent to the A-side of the call.
The cause codes logged in the RADIUS records will be set to 0x66 and 0x13 for the B-side and A-side respectively
The RTP IP address of the B-side (In case of egress H.323) will be logged depending on whether the B-side has sent the OLC back to the IMG or not.
The RTP IP address of the B-side (In case of egress SIP) will be logged as ‘0.0.0.0’ since the IMG did not receive the 200 OK.