Summary:	ASTERISK-21664: Asterisk terminates calls if Session-Expires isn't present on INVITE
Reporter:	Alec Davis (alecdavis)	Labels:
Date Opened:	2013-04-22 05:58:42	Date Closed:	2013-05-02 02:31:38
Priority:	Major	Regression?	Yes
Status:	Closed/Complete	Components:	Channels/chan_sip/Interoperability
Versions:	11.4.0	Frequency of Occurrence	Frequent
Related Issues:	is caused by ASTERISK-20787 Asterisk should inspect Min-SE header in an INVITE even if there is no Session-Expires present is related to ASTERISK-22551 Session timer : UAS (Asterisk) starts counting at Invite, UAC starts counting at 200 OK.
Environment:	SVN-branch-1.8-r385916M	Attachments:	( 0) bug21664.diff.txt ( 1) session_expired-1.8_sip_debug.txt
Description:	RFC 4028 Section 7.2  "UACs MUST be prepared to receive a Session-Expires header field in a  response, even if none were present in the request." With phone GXP1200 Session-Expires = 180 Asterisk Session-Expires = 1800 Outbound sip call will last 17 Minutes and 27 Seconds This is because asterisk now sends the 'Session-Expires: 1800' in the SIP OK 200 response since ASTERISK-20787 when 'Supported: timer' header is present. After 900 seconds, asterisk refreshes with an INVITE, but the phone's response has 'Session-Expires: 180' in the SIP OK 200 response. Asterisk currently ignores this request for 180 second refreshes. So after another 180 seconds, the phone sends a BYE, with "SESSION EXPIRED" on the display. 1048 seconds = 17m28s = 1800/2 seconds + 180 seconds - 32seconds(recommended before expiration see RFC4028 section 10)
Comments:	By: Alec Davis (alecdavis) 2013-04-22 06:01:26.226-0500 attached bug21664.diff.txt By: Alec Davis (alecdavis) 2013-04-22 06:27:39.848-0500 attached 'session expired-1.8 sip debug.txt'