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Table of Contents
Common SIP problems
Phone don't stop ringing after hangup
Some SIP clients fail to send correct CANCEL requests to terminate phone ringing.
Enable Strip route information from 180 responses on Advanced SIP settings page for a workaround.
Phone goes silent in middle of call
It could be the phone doesn't support mid-session port changes. Enable Reuse port numbers within session on Advanced SIP settings page for a workaround.
Media doesn't go through VPN tunnel
If for example media from an ITSP goes directly to a remote caller, not through the IPSec tunnel she has to Internet Gate, you need to enable Relay media for calls over VPN on Advanced SIP settings page to force media from ITSP to Internet Gate so it can forward it through the IPSec tunnel to the caller.
