On Wed, 2005-12-28 at 12:56 -0800, Anil Bollineni wrote:
>             According to RFC 3261 19.1.1
> 
>      "The set of valid telephone-subscriber strings is a subset of valid
> user strings."

>      Since the 'user' info part of SIP URL does not cover "#" symbol
> according rfc 3261 syntax for 'user'.
> 
> According to RFC 2806, the syntax for telephone-subscriber is
> 
> telephone-subscriber= 1*dtmf-digit
> 
> dtmf-digit            = "*" / "#" / "A" / "B" / "C" / "D"

> How can telephone-subscriber string is a subset of valid user string? 

Read the BNF more carefully:

SIP-URI          =  "sip:" [ userinfo ] hostport
                    uri-parameters [ headers ]
SIPS-URI         =  "sips:" [ userinfo ] hostport
                    uri-parameters [ headers ]
userinfo         =  ( user / telephone-subscriber ) [ ":" password ] "@"
user             =  1*( unreserved / escaped / user-unreserved )

As you can see, "telephone-subscriber" is *included* in "userinfo".

Dale


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