Sharath
The Cseq for UAC and UAS are separate counters. For each, the value must
increase monotonically from request to request.
In the example you have shown, you MAY send 2 BYE or 3 BYE, but you SHOULD
send 2 BYE. You should never skip a value if you want to track requests that
are lost.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Sharath
Rajasekar
Sent: Friday, March 23, 2001 12:38 PM
To: Jonathan Rosenberg
Cc: [EMAIL PROTECTED]
Subject: [Sip-implementors] Question about CSeq Numbers
Hi,
A question about CSeq numbers in SIP transactions is
- is it necessary for the CSeq for increase monotonically
from INVITE to BYE or can a BYE have a CSeq that is lesser
than that of the last (re)INVITE.
eg.
A B
| |
| |
|<---------INVITE-------|
|---------100---------->|CSeq=101INVITE
|---------200OK-------->|
|<---------ACK----------|
| |
| |
|---------INVITE------->|
|<--------200OK---------|CSEQ=102INVITE
|---------ACK---------->|
| |
| |
|---------INVITE------->|
|<--------200OK---------|CSEQ=103INVITE
|---------ACK---------->|
| |
| |
|<--------BYE-----------|CSEQ=102BYE
| |
| |
Is this legal or should the CSeq be 103BYE ?
Thanks and Regards
Sharath
-----------------
Sharath Rajasekar
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