[SIPForum-discussion] FAKE RBT Scenarios

[Stephen James]

This is pretty normal for early media such as custom ringback or announcement from the far end. 
Since the 183 doesn't have 100rel/PRACK then sending SDP twice is ok. If the 183 is sent reliably there shouldn't be SDP is later responses.


 
Stephen James 
sjames_1958 at yahoo.com
 
We are not princes of the earth, we are the descendants of worms, and any nobility must be earned.



________________________________
 From: Shah Hussain Khattak <shahhusayn at msn.com>
To: "discussion at sipforum.org" <discussion at sipforum.org> 
Sent: Tuesday, January 28, 2014 12:19 PM
Subject: [SIPForum-discussion] FAKE RBT Scenarios
 


 
Hello All SIP Experts, 

Can you guys please confirm me is below scenario normal:

Call Invite ---------------->

183 session in progress without SDP <----------------------------
183 session in progress with SDP      <----------------------------

then

180 ringing with SDP <---------------------------------------------

i just want to know is above call flow normal? 

2nd thing, is 180 ringing with SDP creating fake RBT for calling party side? 


Regards, 
Shah Hussain 







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