asterisk users - Aug 2013 - Local agent/member in-use after transfer

I currently have all agents/members logged in with local channels. When a call
is sent to one of the agents, then the agent transfers the call out the line
frees up on their phone but still shows in-use until the call that was
transferred is hung up.
How can I free up the agent/local channel when the call is transferred?
This is a huge problem because the agent can no longer receive calls on their
extension. If they are the only agent logged in, then no other calls can be
answered. If the transferred calls last an hour then no calls can be answered by
this agent for an hour.
I know I can set ringinuse=yes but this causes the agent to be interrupted while
on calls which is not the desired result.
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From: tjrlist at live.com
To: asterisk-users at lists.digium.com
Date: Thu, 1 Aug 2013 12:50:32 -0500
Subject: [asterisk-users] Local agent/member in-use after transfer




I currently have all agents/members logged in with local channels. When a call
is sent to one of the agents, then the agent transfers the call out the line
frees up on their phone but still shows in-use until the call that was
transferred is hung up.
How can I free up the agent/local channel when the call is transferred?
This is a huge problem because the agent can no longer receive calls on their
extension. If they are the only agent logged in, then no other calls can be
answered. If the transferred calls last an hour then no calls can be answered by
this agent for an hour.
I know I can set ringinuse=yes but this causes the agent to be interrupted while
on calls which is not the desired result.

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I found a solution and wanted to post it for those that may run into this
trouble in the future.
I use the manager interface to login my agents using a web page.
After much digging I finally found the StateInterface: option available in 1.6
and above. I added it to my PHP login screen like this..
fputs($socket2, "StateInterface: SIP/".$agentid."\r\n");
The problem is that the queue was monitoring the local channel in terms of when
a call was hungup or not, allowing other calls to come through.
When a transfer happened the Local channel was not released.
Adding the StateInterface option apparently allows the queue to monitor the
actual channel, not the local channel. I couldn't find much documentation on
this option, just stumbled upon it.
Fixed my issue though! Thought I would add to the little info that seems to be
out there about this option.
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