Call shows as "answered" in CDR but call kept ringing on Bria

an inbound call was placed to our queue and the call was routed to an agent who is a remote user connected via an OpenVPN VPN tunnel. When he answered the call, it was shown as "connected" on his Bria 3 softphone, however but there was dead air and dropped after a few seconds. Then the call rang again to his phone, which he could not pick up and then went to voicemail. In the CDR, the call is shown as answered but then the same call continued being in the queue and kept ringing until it reached voicemail. The extension concerned is 7806. This extension also has a FollowMe configured in "ringall" to a mobile number. The call is from 15149076158.

I am attaching to this bug the Queue Configuration and the logs for this call.

Queue.conf:

[7701]
announce-frequency=0
announce-holdtime=yes
announce-position=no
autofill=no
autopause=no
autopausedelay=0
eventmemberstatus=yes
eventwhencalled=yes
joinempty=yes
leavewhenempty=no
maxlen=0
memberdelay=0
music=ServiceDesk
penaltymemberslimit=0
periodic-announce-frequency=0
queue-callswaiting=silence/1
queue-thereare=silence/1
queue-youarenext=silence/1
reportholdtime=no
retry=5
ringinuse=no
servicelevel=60
setinterfacevar=yes
strategy=ringall
timeout=15
timeoutpriority=app
timeoutrestart=yes
weight=0
wrapuptime=0