On 09/19/2011 01:16 PM, Alex Vishnev wrote:

no, you need a tag i.e From: <sip:p...@xx.xx.xx.xx>;tag=xxxxxxx, where
xxxxxx is a unique identifier

see the definition of SIP Dialog

Dialog: A dialog is a peer-to-peer SIP relationship between two
          UAs that persists for some time.  A dialog is established by
          SIP messages, such as a 2xx response to an INVITE request.  A
          dialog is identified by a call identifier, local tag, and a
          remote tag.  A dialog was formerly known as a call leg in RFC
          2543.

OPTIONS requests don't create a dialog, just a transaction.

--
Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/

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