[SIPForum-discussion] CALL-ID

[shawn.degraw at comcast.net]

See below excerpt from RFC3261: 

8.1.1.4 Call-ID The Call-ID header field acts as a unique identifier to group
   together a series of messages.  It MUST be the same for all requests
   and responses sent by either UA in a dialog.  It SHOULD be the same
   in each registration from a UA.

   In a new request created by a UAC outside of any dialog, the Call-ID
   header field MUST be selected by the UAC as a globally unique
   identifier over space and time unless overridden by method-specific
   behavior.  All SIP UAs must have a means to guarantee that the Call-
   ID header fields they produce will not be inadvertently generated by
   any other UA.  Note that when requests are retried after certain Rosenberg, et. al.          Standards Track                    [Page 37] RFC 3261            SIP: Session Initiation Protocol           June 2002 failure responses that solicit an amendment to a request (for
   example, a challenge for authentication), these retried requests are
   not considered new requests, and therefore do not need new Call-ID
   header fields; see Section 8.1.3.5.

   Use of cryptographically random identifiers (RFC 1750 [12]) in the
   generation of Call-IDs is RECOMMENDED.  Implementations MAY use the
   form "localid at host".  Call-IDs are case-sensitive and are simply
   compared byte-by-byte.

      Using cryptographically random identifiers provides some
      protection against session hijacking and reduces the likelihood of
      unintentional Call-ID collisions.

   No provisioning or human interface is required for the selection of
   the Call-ID header field value for a request.

   For further information on the Call-ID header field, see Section
   20.8.

   Example:

      Call-ID: f81d4fae-7dec-11d0-a765-00a0c91e6bf6 at foo.bar.com 


----- Original Message ----- 
From: "Deepak Bhatia" <deepak.bhatia at nechclst.in> 
To: discussion at sipforum.org 
Sent: Tuesday, December 7, 2010 2:25:12 AM 
Subject: [SIPForum-discussion] CALL-ID 


----- Original Message ----- 
From: "Deepak Bhatia" <deepak.bhatia at nechclst.in> 
To: discussion at sipforum.org 
Sent: Tuesday, December 7, 2010 2:25:12 AM 
Subject: [SIPForum-discussion] CALL-ID 




Hi, 



All SIP UAs must have a means to guarantee that the Call-ID header fields they produce will not be inadvertently generated by any other UA. 



How is it achieved ? 



Regards 



Deepak Bhatia DISCLAIMER: 
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