[asterisk-bugs] [JIRA] (ASTERISK-19942) SIP Session Timers do not honour refresher

[Jon Bonilla (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-19942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=198688#comment-198688 ] 

Jon Bonilla commented on ASTERISK-19942:
----------------------------------------

Taken from a comment in another place where I've been talking about this issue and interoperability tests:

it's the Session-Expires header that indicates how 
SST are applied, and if the UAS says 'refresher=uas' then the UAS is 
supposed to do the refresh.

The bit regarding the Require and why it's a MUST is explicitely 
explained:
"""
If the refresher parameter in the Session-Expires header field in the
    2xx response has a value of 'uac', the UAS MUST place a Require
    header field into the response with the value 'timer'.  This is
    because the uac is performing refreshes and the response has to be
    processed for the UAC to know this.
"""

If asterisk doesn't compute the refresher role properly, it should not 
add Session-Expires header in the first place (it can still do 
refreshes as it likes, regardless of what intervals are negotiated or 
not).
                
> SIP Session Timers do not honour refresher
> ------------------------------------------
>
>                 Key: ASTERISK-19942
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-19942
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/Interoperability
>    Affects Versions: SVN, 1.8.8.2, 1.8.10.1, 1.8.13.0
>         Environment: SIP communication between Asterisk 1.8 versions and Sems 1.4.X stable releases. Used Linux Debian 6.0
>            Reporter: Jon Bonilla
>            Assignee: Jon Bonilla
>         Attachments: scenario4_asterisk_log_full.txt, scenario4_asterisk_sip.conf, scenario4.pcap, scenario5_asterisk_log_full.txt, scenario5_asterisk_sip.conf, scenario5.pcap
>
>
> Tested different session-timer settings in sip.conf and asterisk does not honour refresher. It sends INVITE requests when it should not ot does not send any when it should. Depends on the configuration or scenario. Tested several scenarios to report. I'll add scenarios in notes.

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