Hi Lorenzo,
     You are right. The proxy should send the request to the
user 3000 in the format you have shown. Proxies must not
modify the To header. The To header indicates the intended
target only. The final recepient of the request may be different
from that in the To header - as long as the Request-URI indicates
the recepient of the request, the call should be accepted. So
user 3000 should accept the call since it finds itself in the
Request-URI. You could refer Section 8.2.2.1 of the RFC that
discusses how a user agent should process the To/R-URI of
a request that it receives.

Hope that helps.
Subhash Nayak
Hughes Software Systems
http://www.hssworld.com





"Boffelli, Lorenzo" <[EMAIL PROTECTED]> on 07/23/2003
09:28:17 PM

To:   [EMAIL PROTECTED]
cc:   "Sinigaglia, Luca" <[EMAIL PROTECTED]>, "Cordella,
      Marco" <[EMAIL PROTECTED]>, "Basili, Francesco"
      <[EMAIL PROTECTED]> (bcc: Subhash Ullal
      Nayak/HSSBLR)

Subject:  [Sip-implementors] Call Forward on busy




Hello

Suppose to have three sip users
[EMAIL PROTECTED] located at host1.voip.net
 <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] located at host2.voip.net
 <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED] located at host3.voip.net

All the sip users are registered at voip.net proxy providing the call
forward on busy.
If the user [EMAIL PROTECTED] is busy the proxy forward the call to the user
[EMAIL PROTECTED]

User [EMAIL PROTECTED] calls user [EMAIL PROTECTED]
The invite sent by 1000 has the following haders:
    RequestURI: sip:[EMAIL PROTECTED]
    From: sip:[EMAIL PROTECTED]
    To: sip:[EMAIL PROTECTED]

The proxy forwards the call to the user 2000 but it is busy so the proxy
forwards the call to the user 3000 using the following headers:
    RequestURI: sip:[EMAIL PROTECTED]
    From: sip:[EMAIL PROTECTED]
    To: sip:[EMAIL PROTECTED]

The proxy does not change the To header. Is this correct. Must the user
3000 accept the call even if the To header is not [EMAIL PROTECTED]

Thank you
Regards
Lorenzo
Hello
 
Suppose to have three sip users
[EMAIL PROTECTED] located at host1.voip.net
[EMAIL PROTECTED] located at host2.voip.net
[EMAIL PROTECTED] located at host3.voip.net
 
All the sip users are registered at voip.net proxy providing the call forward on busy.
If the user [EMAIL PROTECTED] is busy the proxy forward the call to the user [EMAIL PROTECTED]
 
The invite sent by 1000 has the following haders:
    RequestURI: sip:[EMAIL PROTECTED]
 
The proxy forwards the call to the user 2000 but it is busy so the proxy forwards the call to the user 3000 using the following headers:
    RequestURI: sip:[EMAIL PROTECTED]
 
The proxy does not change the To header. Is this correct. Must the user 3000 accept the call even if the To header is not [EMAIL PROTECTED]?
 
Thank you
Regards
Lorenzo

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