Subject: [Sip] 486/603 Response issue in Proxy server

From: Nitin Kumar <[email-masked]>
Date: Sun, 6 Apr 2003 12:12:51 +0530

hi Folks,

Would like to get some clue on following issue.

I am using "SIP express Router" as my proxy server to test our SIP user
agents.
Now if one UA(lets say party A) sends INVITE to other UA (lets say party B)
via proxy server, we are finding that any non-2xx response (like 486 busy,
603 decline) received by proxy server from party B is not forwarded to party
A. Moreover proxy server is also sending valid ACK to non-2xx response to
party B. 

	A				PS (SIP express router)
B
	|					|
|
	|----------INVITE------------>|					|
	|
|----------INVITE------------>|	
	|<---------100 trying---------|					|
	|					|<---------100
trying---------|
	|					|
|
	|					|<---------180
trying---------|
	|<---------180 trying---------|					|
	|					|
|
	|					|<---------603
decline--------|
	|	603 not forwarded	      |
|
	|
|------------ACK------------->|
	|					|
|
	|					|
|
	|					|
|

any idea what may be the reason?

In case of successful call everything works fine.

will appreciate some clue from sip experts.

regards,
-nitin
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