[asterisk-bugs] [JIRA] (ASTERISK-21747) SIP Session-Expires: Set timer to correctly expire at (~2/3) of the expiry interval when not the refresher.

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-21747:
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             Summary: SIP Session-Expires: Set timer to correctly expire at (~2/3) of the expiry interval when not the refresher. 
                 Key: ASTERISK-21747
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21747
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
         Environment: SVN-branch-11-r386878M 
            Reporter: Alec Davis
            Assignee: Alec Davis
            Severity: Minor


RFC 4028 Section 10

	if the side not performing refreshes does not receive a
	session refresh request before the session expiration, it SHOULD send
	a BYE to terminate the session, slightly before the session
	expiration.  The minimum of 32 seconds and one third of the session
	interval is RECOMMENDED.

Testing:

asterisk to phone.
Phone's Session-Expires: 120

[Apr 30 22:49:20] NOTICE[12686][C-00000000]: chan_sip.c:29006 start_session_timer: Session timer started: 104 - 50a7397219b8f47e192f74e81f3b125e at 192.168.x.y:5060 88000ms
<<<<<  pull ethernet on phone >>
<<<<<  88 seconds later       >>
[Apr 30 22:50:48] WARNING[12686]: chan_sip.c:29042 proc_session_timer: Session-Timer expired - 50a7397219b8f47e192f74e81f3b125e at 192.168.x.y:5060


Phone to Asterisk, No Session-Expires
Asterisk's Session-Expires: 300
[Apr 30 23:47:02] NOTICE[12857][C-00000001]: chan_sip.c:29006 start_session_timer: Session timer started: 99 - 7160947918a9977c at 192.168.124.73 150000ms

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