asterisk users - Nov 2009 - Scheduling destruction of SIP dialog

Hello,

I got situation which is unclear for me, hope somebody could explain this.

A calls to B

INVITE sent from A to B
B responds with 100 Trying
B responds with 183 Progress
After 10 seconds: Asterisk CLI: Scheduling destruction of SIP dialog
'..' in
32000 ms (Method: INVITE)
Asterisk sends CANCEL _instantly_
B responds with 200 OK and 487 Request Terminated
Asterisk confirms 102 ACK
CLI: Really destroying SIP dialog '..' Method: INVITE
Call terminates

Asterisk version 1.4.18.1

Total call duration: 11s

Timeout on call to B is set to 60 seconds:
'SIP/0277027277555 at prov7|60|S(7197)'

Call log is here: http://pastebin.ca/1667975



Why Asterisk decided to terminate the call?



Regards,
Mindaugas Kezys
http://www.kolmisoft.com
VoIP Billing and Routing Solutions