[SIPForum-discussion] No Ring Back Tone Issue

[WIGNELL, CLIFFORD (CLIFFORD)]

Hello Raghul,

 

Look at RFC3666, it describes the SIP<->PSTN call flows, by contrast
RFC3665 provides "normal" SIP flows; good places to start.

 

Best regards

 

Cliff Wignell

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Raghul Prasanna
Sent: Friday, 29 August 2008 5:33 AM
To: Vivek Batra
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] No Ring Back Tone Issue

 

HI Vivek,

 

 

 From your explanation I can understand that 183 with SDP result in
early media, but incase of 180 with or without SDP with no 183, will
reult in UA playing local ringback tone..

 

Just want to know is there any RFC that says the above point...

 

Thanks,

Raghul

--- On Wed, 27/8/08, Vivek Batra <vivek7683 at gmail.com> wrote:

	From: Vivek Batra <vivek7683 at gmail.com>
	Subject: Re: [SIPForum-discussion] No Ring Back Tone Issue
	To: "ramon nolasco" <rpnolasco at yahoo.com>
	Cc: discussion at sipforum.org
	Date: Wednesday, 27 August, 2008, 4:09 PM

	Comments inline in RED.
	
	--VB

	On Wed, Aug 27, 2008 at 9:23 AM, ramon nolasco
<rpnolasco at yahoo.com> wrote:

	Hi All,

	 

	Greetings and a good day to all of you! I have this and quite a
rare one to me of "no ring back tone" problem with one of our
interconnecting partners. Partner claims that our system normally sends
"183 Session Progress" and "180 Ringing". That we are sending "183
Session Progress" without the ringtone data though our "180 Ringing" has
a ringtone data. That their system looks for the ringtone data to
process from the first received message response, which is our "183
Session Progress" and afterward disregards our "180 Ringing" response
that followed, wherein the ringtone data is indeed present,  thus
resulting to a successfull call but without ringback tone. 

	 

	My questions are, per standard:

	1.	When and why does "183 Session Progress" is being sent
as a response?

	 '183 Session Progress' or referred as Early Media is generally
sent when media (RTP) is required within early dialog. 
	Media is required in the early dialog when the call is placed
from IP to PSTN. 
	When ITSP/ Gateway routes the call from IP to PSTN, it generally
sends the 183 response with SDP body and all the tones/ message are
played by gateway to UA. However in case of 180 Ringing, RBT is played
by local UA itself.

		1.	 
		2.	Should "183 Session Progress" sometimes also can
replace "180 Ringing", thus have the ringtone data? or

	Yes. It depends on the local policy of UA whether it wants to
stop the media created with 183 Session Progress and start playing local
RBT or discards the 180 Ringing (recieved after 183 Session Progress)
and remains connect the media till the final response. 
	You will found lot of UA in the marked having both type of
implementations. 

	 

		1.	 
		2.	or it's always "180 Ringing" that has the
ringtone data?

	I am not sure what you are referring as Ringtone data. I believe
that you are referring whether 180 Ringing has SDP or not.
	If you are referring the same, my answer would be Yes. 180
Ringing can have SDP body but this is not used to connect early media.
180 Ringing with SDP refers the Offer-Answer model as per RFC 3262.
	Only 183 Session Progress is sent as response to connect early
media.

		1.	 
		2.	Our setup is SBC-to-SBC, Huawei Eudemon
2300-to-Mediaring Voizbridge, is it us who really has the problem or who
needs then to adjust? Adjust what?

	In the above statements, you are referring that 183 Session
Progress has no ringtone data. What actually you are referrig? You want
to say that 183 Session Progress has no SDP? 
	Can you provide us the complete call flow?

		1.	 
		2.	Is my partner's claim of "the should be system
flow and process" standard?

		Appreciate any of your solution advice and many thanks
in advance :)

		 

		Best regards,

		 

		Mon

		 

		
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