Yeah, we don't use Buddy Watch. We don't use call-limit because we want call-limit. We use it because it's the only way, that I'm aware of, to get the SIP channel driver to monitor the state of the member SIP interface. We use autopause=yes and ringinuse=no in our customer service queue configuration. Without specifying call-limit, the Queue application continues to send new calls to member interfaces that are in-use or busy. The SIP device replies to Asterisk saying it's busy and the Queue application pauses the member because of autopause. With call-limit enabled and set to any number, the Queue application knows that the member interface is busy and will not send new calls.

I replied to this post describing our findings with the Queue application because it sounds like the same behavior occurs with hints and buddy watch. The state detection in the SIP channel driver appears suspect to me.

Eric "ManxPower" Wieling wrote:
James Fromm wrote:

The behavior we see is that the SIP interface in the queue will sometimes not release from the in-use state. Connecting to the interface from another SIP device and immediately hanging up will clear the state. The phones in question are configured with one line that will except only one call. The device itself does not think it is in-use because it will accept another call. Something in the SIP channel driver is not clearing the state when a call is completed.

There is definitely no correlation between this and Asterisk restarting. In fact, if a device is 'stuck' on in-use, restarting Asterisk will clear the state.

I've been working on this for a week now. It only started for us because I just implemented the call-limit option in the sip.conf in Asterisk for the devices. See my posts with subject 'Queue and Interface time out'.

I believe there is/was a bug relating to call-limit. Buddy Watch doesn't work if you use call-limit and if a call from a queue is transfered, the call-limit is not released until the original call is terminated. I do not know if these issues have been fixed or not.
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