The Contact's ABNF is within RFC 3261 section 25.1. 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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