Thanks Brett, appreciate your response. 
I am going to check rfc 3966. 
Ericsson has a SIP server which doesn't like user=phone with Anonymous.
Samsung has a SIP server which sends Anonymous with user=phone. 
Without a specific spec or a RFC, its hard to tell who is right and who should 
change. 
 
Vivek.
 




----- Original Message -----
From: Brett Tate <[email protected]>
To: Vivek Singla <[email protected]>; 
"[email protected]" 
<[email protected]>
Cc: 
Sent: Friday, February 1, 2013 12:57 PM
Subject: RE: [Sip-implementors] Any RFC reference for "user=phone" in case of 
an Anonymous From header

Unfortunately, RFC 3261 is underspecified concerning the user=phone topic and 
sipcore doesn't seem to want to fix the issue.  Thus do whatever you want. :)

The following link is to one of the replies that I received concerning the 
topic.

http://www.ietf.org/mail-archive/web/sipcore/current/msg01784.html 


Some vendors will not like receiving a user=phone when the user portion of 
sip-uri is missing or does not decode as a telephone-subscriber per RFC 3966 
(or RFC 2806).

Anonymous examples can be found within RFC 3261, RFC 3323, and RFC 3325.  They 
do not include user=phone.


> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Vivek Singla
> Sent: Friday, February 01, 2013 1:21 PM
> To: [email protected]
> Subject: [Sip-implementors] Any RFC reference for "user=phone" in case
> of an Anonymous From header
> 
> 
> Hi,
> I am looking for some RFC reference where I can find how to populate a
> FROM header, when the caller is anonymous.
> 
> Basically when we send user=phone, is it MUST to send a phone number.
> 
> Alternatively, if I send anonymous in the FROM header, is it MUST to
> not send user=phone?
> 
> 
> Vivek.

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