[SIPForum-discussion] SIP REFER and new INVITE

[sampath.kumar1 at wipro.com]

Hi Praveen,

 

First of all Thanks a lot for your reply!.

 

Yes, your understanding of my question is correct.

And my understanding from your answer is that the same protocol which
was used in the first call will be used in the second call also.

And the referring ua or proxy does not decide which protocol it should
use. 

 

This question is raised because, I am working on scenario like, the new
INVITE message after the REFER is not using the same schema that it is
received in the Refer-To header.

For example: In the first call (first INVITE message) it uses a SIP:
schema and if the REFER method carries a Refer-To header with SIPS:
schema. In this case the expectation is to use SIPS: schema in the new
call (New INVITE message).

In this case if the first call is established with UDP protocol and if
the Refer-To header contains SIPS: schema in the REFER method then how
it should work. And will there be any case like this.

 

 

Thanks,

Sampath

________________________________

From: praveena ss [mailto:ss.praveena at gmail.com] 
Sent: Thursday, October 07, 2010 11:09 PM
To: Sampath Kumar (WT01 - GMT-Telecom Equipment)
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SIP REFER and new INVITE

 

Hello sampath,

   I think u r talking about call transfer. see once user A is register
with either UDP or TCP the same transport protocol will be used for
session. In your case, user agent A is making a call second time the
same transport which was used in first call with user agent B.

 

Suppose if User agent A is in UDP and user agent C is in TCP the sip
server/proxy will take care of this.

 

let me know, if my answer is not suets to you question.

 

Regards,

Praveen

 

On Thu, Oct 7, 2010 at 9:08 AM, <sampath.kumar1 at wipro.com> wrote:

Hi All,

 

Can some one please help in the following scenario?

 

User agent 'A' calls UA 'B' and now 'B' want to refer to another UA 'C'.

Now 'B" sends REFER method to 'A' and receives a NOTIFY message.

And now a new INVITE message will be sent to 'C' and call will be
established.

 

My question is, if the first call is an UDP call and now who will decide
which transport protocol it should use in the second call towards 'C'.

 

Thanks in advance,

 

Regards,

Sampath kumar

 

 

 

 


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