I have a problem with a Grandstream GXP2170 connected to FreePBX (last version, all updated).
After a call, randomly, the user hangs up, but the phone remains “busy”. The management GUI reports that a call is in progress, and the user cannot start any outgoing calls.
If an other extension calls that phone, the call is started and after a few seconds terminated. Nothing rings. The SIP flow reports that the phone with the problem has responded, than performed a normal hangup terminating the call.
If a new incoming call is received from an external trunk, FreePBX will forward that a Queue where this phone is the only member, and the phone seems fix the wrong status.
This makes us crazy, any idea?