Re: [Sip] Target Refresh Request and Contact Header

[Paul Kyzivat <[e-mail]>]

IMO it should be MUST. I suspect is is weaker for 2543 compatibility.

	Paul

David Roan wrote:
> According to RFC 3261, the following is stated in section 12.2.1.1 
> <http://12.2.1.1>:
> A UAC SHOULD include a Contact header field in any target refresh 
> requests within a dialog, and unless there is a need to change it, the 
> URI SHOULD be the same as used in previous requests within the dialog.  
> If the "secure" flag is true, that URI MUST be a SIPS URI.As discussed 
> in Section 12.2.2, a Contact header field in a target refresh request 
> updates the remote target URI.  This allows a UA to provide a new 
> contact address, should its address change during the duration of the 
> dialog.
>  
> This seems to indicate that including the Contact header in a target 
> refresh request (ie, Re-INVITE or UPDATE) is only a strong 
> recommendation (ie, "SHOULD" vs "MUST").
>  
> However, table 3 in section 20 of RFC3261 seems to contradict this, as 
> it lists the Contact header as "m":
> Header field              where       proxy ACK BYE CAN INV OPT REG
> ___________________________________________________________________
> Contact                      R                      o       -      -     
> m     o      o
>  
> Also, table 1 in section 8 of RFC3311 lists the Contact header as "m" 
> for the UPDATE request.
>  
> Is there any consensus as to which is considered the correct statement? 
> MUST the Contact header be included in target refresh requests(as 
> indicated by the header tables in RFC3261 and RFC3311)? Or, SHOULD the 
> Contact header be included in the target refresh request(as indicated by 
> section 12.2.1.1 <http://12.2.1.1> of RFC3261)?
> 
> Thanks in advance for any input, insight, or clarification.
> John D. Roan
> 
> 
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