Re: [Sip-implementors] Call Forward on busy

Wed, 23 Jul 2003 12:25:42 -0700

Comment InLine

"Boffelli, Lorenzo" <[EMAIL PROTECTED]> wrote:
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 Proxy is say having the intelligence to do call fwd on busy (which is it mimicks the behaviour of Redirect to quite some extend) where in on recetion of a busy 486, it will complete than transaction with a ACK and issue a fresh INVITE to the 3rd party ([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]
 
>> I would think the fresh INVITE from proxy to 3000 will be as below, addressing the To: to [EMAIL PROTECTED]
    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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