[SIPForum-discussion] No Ring Back Tone Issue

[Shakil, Rashid]

Answers to your questions

 

1.	183 Session Progress is for early media. If you are receiving it
from far end then this could be related to what SS7 trunk respond back
to SIP carrier. 
2.	Don't know what you mean by replace here. 180 Ringing should
give you ring back tone rite after 200 OK. For early media 183 Session
Progress both sides have to send RTP rite after 183 is received and not
wait for 200 OK
3.	Answer in 2
4.	Do an ethereal capture on outside interface of your SBC and
carriers SBC. See which side is sending ring back tone and which side is
blocking it then look for early media setting in the SBC (probably in
SIP profile setting depending on what kind of SBC both parties are
using).

 

Hope that help

 

Regards,

 

Rashid Shakil  

 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of ramon nolasco
Sent: Tuesday, August 26, 2008 11:54 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] No Ring Back Tone Issue

 

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?
2.	Should "183 Session Progress" sometimes also can replace "180
Ringing", thus have the ringtone data? or
3.	or it's always "180 Ringing" that has the ringtone data?
4.	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?
5.	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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