[cisco-voip] SIP disposition after 488 to T.38

[Fedorov, Konstantin]

Hi Roy,

Ok, I understand.

I think its depends, which method of fax sending you use.

1/ If fax machine auto answer call, then after no more sip messages can
be.

2/ If before fax sending you open voice stream, I mean you talk with
person 
Which must receive fax, then after fail attempt its possible to send
again re-invite.

-----------------------
Sincerely Yours,
Konstantin Fedorov

-----Original Message-----
From: roy [mailto:bandwidth.user at gmail.com] 
Sent: Friday, June 29, 2007 6:55 AM
To: Fedorov, Konstantin
Cc: cisco-voip
Subject: RE: [cisco-voip] SIP disposition after 488 to T.38

Hi Konstantin,

When a call from the sip box hits an IVR/fax, the cisco box detects the
SIT and tries to negotiate t38. 488 has been sent since the SIP box has
disabled t38.  There would have been a fall-back if g711 is available,
but, due to some constraints, 711 isn't available. Hope I'm not missing
something here.

Thanks,

Roy

On Thu, 2007-06-28 at 18:20 +0400, Fedorov, Konstantin wrote:
> Hi,
> 
> Can you provide full capture of SIP signaling.
> Because now its difficult to say what is the reason jf 488 message.
> 
> 488 message mean - Not applicable here.  So SIP box doesn't like
> re-invite
> 
> -----------------------
> Sincerely Yours,
> Konstantin Fedorov
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of roy
> Sent: Thursday, June 28, 2007 8:36 AM
> To: cisco-voip
> Subject: [cisco-voip] SIP disposition after 488 to T.38
> 
> Hi List,
> 
> Here's a setup and packet capture flow:
> 
> SIP box				Cisco
> [a at b.com]			[x at y.com]
> INVITE	x at y.com	--------->	
> 		<---------	100 TRYING
> 		<---------	183 Session Progress
> 		<---------	200 OK
> ACK	x at y.com	--------->
> 		<---------	re-INVITE a at b.com to t.38
> 488		--------->
> 		<---------	ACK
> ...
> ...
> 
> Given that only available codec of g.729 at Asterisk side, what
messages
> are to be expected after the T.38 re-invite has been made and was
> rejected with 488?
> 
> Thanks,
> 
> Roy
> 
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