The "user=phone" parameter is significant in context of SIP url where
it indicates that the user part of SIP url is telephone number.
Though, it has no meaning in TEL specification, the grammar does
permit it as generic parameter. This implementation should ignore it
if it does not understand.

On Fri, May 29, 2009 at 1:14 PM, Abhishek Dhammawat
<[email protected]> wrote:
> Hi
>
> TEL URI does not have the "user=param" syntax.
>
> Please refer section 3 of RFC 3966 for the tel URI syntax.
>
> The "tel" URI has the following syntax:
> telephone-uri = "tel:" telephone-subscriber
> telephone-subscriber = global-number / local-number
> global-number = global-number-digits *par
> local-number = local-number-digits *par context *par
> par = parameter / extension / isdn-subaddress
> isdn-subaddress = ";isub=" 1*uric
> extension = ";ext=" 1*phonedigit
> context = ";phone-context=" descriptor
> descriptor = domainname / global-number-digits
> global-number-digits = "+" *phonedigit DIGIT *phonedigit
> local-number-digits =
> *phonedigit-hex (HEXDIG / "*" / "#")*phonedigit-hex
> domainname = *( domainlabel "." ) toplabel [ "." ]
> domainlabel = alphanum
> / alphanum *( alphanum / "-" ) alphanum
> toplabel = ALPHA / ALPHA *( alphanum / "-" ) alphanum
> parameter = ";" pname ["=" pvalue ]
> pname = 1*( alphanum / "-" )
> pvalue = 1*paramchar
> paramchar = param-unreserved / unreserved / pct-encoded
> unreserved = alphanum / mark
> mark = "-" / "_" / "." / "!" / "˜" / "*" /
> "’" / "(" / ")"
> pct-encoded = "%" HEXDIG HEXDIG
> param-unreserved = "[" / "]" / "/" / ":" / "&" / "+" / "$"
> phonedigit = DIGIT / [ visual-separator ]
> phonedigit-hex = HEXDIG / "*" / "#" / [ visual-separator ]
> visual-separator = "-" / "." / "(" / ")"
> alphanum = ALPHA / DIGIT
> reserved = ";" / "/" / "?" / ":" / "@" / "&" /
> "=" / "+" / "$" / ","
> uric = reserved / unreserved / pct-encoded
>
> regards
> Abhishek Dhammawat
> Aricent
> ________________________________________
> From: [email protected] 
> [[email protected]] On Behalf Of shyam 
> [[email protected]]
> Sent: Friday, May 29, 2009 12:14 PM
> To: [email protected]
> Subject: [Sip-implementors] User=param header in SIP
>
> Hi,
>
>  Can a TEL URI have the "user=param"?
>  here param = phone/ip/token
>
> Thanks,
> Shyam
>
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