asterisk users - Mar 2007 - SIP provider did not send BYE if callee is an queue

Hi,

I have an strange problem and did not understand what happened here.

Iam using an SIP provider to call an analog POTS phone.

I orginate the call to the analog phone and send the call in an queue.

If the analog phone hangs up, the SIP provider did not send BYE and Asterisk 
think the line is still up.

I can repeat this with version 1.2.16 without any problems.


If I make call through from Asterisk to an anlog phone and hang up the phone 
the Sip provider sends Asterisk an BYE and the call is hang up.

So whats the reason why the SIP provider did not send an BYE if the callee is 
an queue?

I did find an workaround to avoid this situation of endless calls but whats 
the detailed reason for this strange endless call.

best regards
Thomas