[asterisk-bugs] [JIRA] (ASTERISK-20570) Asterisk, when acting as the UAS in Session Timer negotiation, fails to add required header in 200 response ("Require: timer")

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-20570:
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             Summary: Asterisk, when acting as the UAS in Session Timer negotiation, fails to add required header in 200 response ("Require: timer")
                 Key: ASTERISK-20570
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20570
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 1.8.18.0, 10.10.0, 10.10.0-digiumphones
            Reporter: Matt Jordan


Pretty much what the summary says.  We have to inform the UAC that they have to look for the Session-Expires header by providing a "Require:timer" header.

RFC 4028, Section 9:

{quote}
   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 the refresher parameter in
   the 2xx response has a value of 'uas' and the Supported header field
   in the request contained the value 'timer', the UAS SHOULD place a
   Require header field into the response with the value 'timer'.  In
   this case, the UAC is not refreshing, but it is supposed to send a
   BYE if it never receives a refresh.  Since the call will still
   succeed without the UAC sending a BYE, insertion of the Require is a
   SHOULD here, and not a MUST.
{quote}

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