Re: [Sip] Reg. session timer+earlyupdate

[Brett Tate <[e-mail]>]

The UAS is compliant; thus sending BYE (because think UAS is acting incorrectly) is not correct behavior.  If the following is the section 9 snippet in question, notice that the dialog's previously negotiated session-expires value has no relevance; the "MUST NOT" is associated the header received within the request.  If you are referring to another "MUST NOT" (within this section or another), please send the paragraph.


"  If the UAS wishes to accept the request, it copies the value of the
   Session-Expires header field from the request into the 2xx response.

   The UAS response MAY reduce its value but MUST NOT set it to a

   duration lower than the value in the Min-SE header field in the

   request, if it is present; otherwise the UAS MAY reduce its value but

   MUST NOT set it to a duration lower than 90 seconds.  The UAS MUST

   NOT increase the value of the Session-Expires header field.
"

From: [e-mail] [mailto:[e-mail]] On Behalf Of Harbhanu
Sent: Tuesday, May 18, 2010 4:35 AM
To: [e-mail]
Subject: [Sip] Reg. session timer+earlyupdate

Hi,
We were unable to locate the specific behavior of session timer handling in UA, for the following scenario:

1. UE1 --- INVITE SE-1800 --> UE2
2. UE1 <--- 183 ------------------ UE2

3. UE1 --- UPDATE SE-600 --> UE2
4. UE1 <--- 200 UPDATE -SE600 -- UE2

5. UE1 <--- 200 INVITE SE-1800 -- UE2

6. UE1 -------------------------  BYE --> UE2
7. UE1 <--- BYE 200 ------------------ UE2


Here, UE1 sends a BYE since UE2(UAS) has increased the value of session expires, which it MUST NOT (4028-Section-9, Page-16).

Please let me know whether this behaviour is correct or not.

Thanks in advance.

Regards,
Harbhanu

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