________________________________________
From: Nitin Kapoor [[email protected]]

While looking at the traces  i noticed that there is *wild space* in FROM 
header between *u...@domain* part  of intial invite. And because of this 
whenever UAS is sending 100 trying with same space then my SBC is unable to 
understand that provisional resposne to reset the timer and hence its keep 
sending the invite to termination side on leg 2.

INVITE sip:#08864#[email protected]<mailto:[email protected]> 
SIP/2.0
Max-Forwards: 69
Session-Expires: 3600;refresher=uac
Supported: timer
To: <sip:[email protected]:5060<http://sip:[email protected]:5060>>
From: <sip:5073877672 @10.63.0.11<http://10.63.0.11>>;tag=3485271050-559728
P-Asserted-Identity:<sip:[email protected]>
Call-ID: 
[email protected]<mailto:[email protected]>
CSeq: 1 INVITE
Allow: INVITE, BYE, OPTIONS, CANCEL, ACK, REGISTER, NOTIFY, INFO, REFER, 
SUBSCRIBE, PRACK
Via: SIP/2.0/UDP 10.63.0.11:5060;branch=z9hG4bK841cda8a0ddaacdcf2da96a615e91489
Contact: <sip:5073877672 @10.63.0.11:5060<http://10.63.0.11:5060>>
Expires: 180
Call-Info: <sip:10.63.0.11>;method="NOTIFY;Event=telephone-event;Duration=500"
Allow-Events: kpml
Allow-Events: presence
Content-Type: application/sdp
Content-Length: 157
________________________________________

There are quite a number of problems with that INVITE:

- There is a space before the "@" in the URI in both the From and Contact 
headers.  A space is not allowed at that location (see RFC 3261 section 25.1 
for the BNF).

- There are two '#' characters in the user of the request-URI of the request 
line.  '#' is not allowed directly in the user of a URI, it must be represented 
as '%23', as in :

INVITE sip:%2308864%[email protected]<mailto:[email protected]> 
SIP/2.0

- There is no User-Agent header describing the UAC that generated this INVITE, 
so it is difficult to know to whom to send a problem report.

I suggest that you correct or replace the UAC.

Dale

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