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Today's Topics:
1. Diff b/w Session and Dialog (Anurag Singh)
2. Re: Is "fmtp" line needed in 200 OK answer?
(Herve Jourdain)
------------------------------------------------------------
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Message: 1
Date: Thu, 13 Dec 2007 14:37:05 +0530
From: "Anurag Singh" <abcanuraggmail.com>
Subject: [SIPForum-discussion] Diff b/w Session and Dialog
To: discussionsipforum.org
Message-ID:
<6fe57b830712130107h3f3c0672x28aa3848634c0927mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
Can anyone explain tahat what is difference b/w a dialog
and a session in
SIP. better if give an example and Why is it needed
--
With regards:
Anurag Singh
abcanuraggmail.com
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Message: 2
Date: Thu, 13 Dec 2007 10:14:44 +0100
From: "Herve Jourdain" <herve.jourdainmstarsemi.com>
Subject: Re: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK
answer?
To: "'Andrea Puddu'" <androjokerhotmail.com>, "'Donald Lee'"
<baolovebaogmail.com>
Cc: discussionsipforum.org
Message-ID: <200712130914.lBD9EjuO071974mailsqr.mstarsemi.com>
Content-Type: text/plain; charset="iso-8859-1"
Would you have by chance access to Eyebeam, on a PC ? It
supports G.729, and
it sets the fmtp parameter?
Just to rule out the incidence of fmtp in your specific
case?
Herve
_____
From: Andrea Puddu [mailto:androjokerhotmail.com]
Sent: jeudi 13 d?cembre 2007 09:50
To: Donald Lee
Cc: Herve Jourdain; discussionsipforum.org
Subject: RE: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK answer?
I've tried to browse other settings but without success.
I need to have G729 codec as first priority :(
Unfortunately I can only take the log from the phone side
...
_____
Date: Thu, 13 Dec 2007 10:05:15 +0800
From: baolovebaogmail.com
To: androjokerhotmail.com
Subject: Re: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK answer?
CC: herve.jourdainmstarsemi.com; discussionsipforum.org
#any other settings that you can try with the sip phone?
such as the
priority of the codec. adjust the g729 codec's priority.
#maybe there are still other reasons cause this issue. Who
sends the BYE?
the AS or SBC?
On 12/12/07, Andrea Puddu <androjokerhotmail.com> wrote:
Thanks for your analysis.
By chance, I've just found a parameter on the phone that can
help me ->
"Full SDP Answer" .... I've switched it to OFF.
Now the phone sends only one codec in the 200 OK response
(g729), but
without the "fmtp" line.
So the phone starts talking in G729 but AS (or SBC) sends a
BYE to the
phone!!!!!
I'm starting to think that SBC does not like the lack of
"fmtp" filed in the
response .....
Andrea
_____
From: herve.jourdainmstarsemi.com
To: androjokerhotmail.com; baolovebaogmail.com
CC: discussionsipforum.org
Subject: RE: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK answer?
Date: Wed, 12 Dec 2007 11:25:55 +0100
Hi,
As far as I remember of RFC 3264, the devices should be
prepared to receive
ANY of the codecs it sends in its offer/response?
So basically, if you respond with 3 codecs, you should be
able to receive at
any time on any of those 3 codecs, and switch between them?
That's why it seems customary on several phones to answer
with only one
codec?
But even if it's stated this way in the specs, I still do
think that before
switching to another codec, the UAs should at least use the
codec that was
agreed for in the negotiation at first (the "highest
priority" one, in your
case G729).
Experience shows, unfortunately, that even if it's usually
the case, it's
NOT ALWAYS the case?
I think you might have an example here, and I know I've met
several devices
? phones or gateways usually ? that would also behave in
this way?
So maybe try with only 1 codec in the response, to see if it
works better?
But if you do so, please switch to outband DTMF (RFC 2833 or
RFC 4733),
because once you give only G729 in the answer there should
not be any
possibility to switch to G711 for in-band DTMF.
And your SDP suggests outband DTMF is not activated.
Regards,
Herve
_____
From: discussion-bouncessipforum.org [mailto:
<mailto:discussion-bouncessipforum.org>
discussion-bouncessipforum.org]
On Behalf Of Andrea Puddu
Sent: mercredi 12 d?cembre 2007 09:35
To: Donald Lee
Cc: discussionsipforum.org
Subject: Re: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK answer?
I agree with your analysis. I've noticed that for example
Cisco and Linksys
phone sends only one codec in the 200 OK SDP envelope.
But... Can the sending of multiple codec in the 200 OK
response be an issue?
I cannot complain with phone provider about this behaviour.
Anyway why does the phone talk with G729 and AS talk with
G711? I'm
wondering if the AS performs a check on fmtp field in the
200 OK response
.................
Thanks,
Andrea
_____
Date: Wed, 12 Dec 2007 16:24:05 +0800
From: baolovebaogmail.com
To: androjokerhotmail.com
Subject: Re: [SIPForum-discussion] Is "fmtp" line
needed in 200 OK answer?
CC: discussionsipforum.org
# the "g" and "G" have no difference.
and the offer indicate that it's not
G729B codec.
# I don't think the lack of fmtp in answer is the reason for
issue. Maybe
the ip phone should reply only one codec in its SDP. Maybe
the multi codec
in answer make the offer confused.
On 12/11/07, Andrea Puddu < androjokerhotmail.com
<mailto:androjokerhotmail.com> > wrote:
Hello guys,
I'm facing an issue when a mobile (common mobile 3G phone)
tries to call an
internal SIP phone through its geographical number.
The issue is that when the SBC sends the INVITE to the IP
phone, in the SDP
enclosure it suggests these codecs:
m=audio 19570 RTP/AVP 18 8 0
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
The 200 OK of the phone (SDP part only) is:
m=audio 57956 RTP/AVP 18 8 0
a=rtpmap:18 g729/8000
a=rtpmap:8 pcma/8000
a=rtpmap:0 pcmu/8000
a=sendrecv
So the IP phone start to talk with G729 and SBC replies with
G711A!!! So I
can't hear the voice coming from mobile phone!!!!
I have two questions:
- Can the difference between the offer (G729) and the answer
(g729) be
significant? I mean the difference because the "g"
is not capital in the
answer
- Can the lack of the "fmtp" line in the answer
cause troubles?
Thanks 1000,
Andrea
_____
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