When I first encounter the issue is interworking with openser server, 
which adds lr=on, but I don't know who is the original author of this behavior. 

Regards,
-Rockson

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of I?aki Baz 
Castillo
Sent: Thursday, November 27, 2008 5:42 AM
To: [email protected]
Subject: [Sip-implementors] Why so many implementations expect "; lr=on" or 
";lr=yes" instead of just "; lr"?

Hi, AFAIK loose routing is exclusively defined in RFC 3261, and it's clear and 
explained in *all* the examples and BNF section that "lr" has no value:

  lr-param          =  "lr"
  <sip:proxy1>,<sip:proxy2>,<sip:proxy3;lr>,<sip:proxy4>

So I wonder why there are various SIP devices that only do loose route if the 
Route/Record-Route header has a parameter like:
  ;lr=on
  ;lr=yes

Of course it's a vendor issue, but... why is this error so common? any historic 
reason I miss?

Thanks.

--
Iñaki Baz Castillo

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