On 21 Mar 2014, at 11:47, Brett Tate <br...@broadsoft.com> wrote:

> The Contact's ABNF is within RFC 3261 section 25.1.  
He asked for a header parameter, not the contact parameter. Where's that 
documented?

/O
> Your new contact
> parameter must conform to contact-extension.  You'd use an equals instead
> of colon.
> 
> Contact        =  ("Contact" / "m" ) HCOLON
>                  ( STAR / (contact-param *(COMMA contact-param)))
> contact-param  =  (name-addr / addr-spec) *(SEMI contact-params)
> contact-params     =  c-p-q / c-p-expires
>                      / contact-extension
> contact-extension  =  generic-param
> generic-param  =  token [ EQUAL gen-value ]
> gen-value      =  token / host / quoted-string
> token       =  1*(alphanum / "-" / "." / "!" / "%" / "*"
>                     / "_" / "+" / "`" / "'" / "~" )
> 
>> -----Original Message-----
>> From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
>> implementors-boun...@lists.cs.columbia.edu] On Behalf Of J C Sunil
>> Kumar Reddy
>> Sent: Friday, March 21, 2014 6:33 AM
>> To: sip-implementors@lists.cs.columbia.edu
>> Subject: [Sip-implementors] Query on Contact header parameter
>> 
>> Hi All,
>> 
>> I need to send a proprietary parameter in contact header in an INVITE
>> message to other end.
>> Something like this:
>> 
>> Contact: "Sunil"
>> <sip:48002@10.128.224.41;transport=tcp>;category:strvalue
>> 
>> Here "category:strvalue" is my proprietary parameter. Where "category"
>> is a
>> param name and "strvalue" is the value.
>> 
>> What does the SIP standard specify? whether it should be colon(:) or
>> Equals(=)?
>> I mean according to SIP standards, which is the correct one?
>> 
>> category:strvalue
>> or
>> category=strvalue
>> or something else?
> 
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