Re: Fax send/receive procedures

I would expect that the one operating Fax 2 would wait for an indication
that change to fax is desired. That would make the handshake in send mode go
through from Fax 1. 
 
The faxes follow ITU-T T.30, so you will find there the sequence for V.21
Flags.
 
Gunnar
  _____  

From: [email protected] [mailto:[email protected]] On Behalf Of
Andre Rosa Stefanini
Sent: Tuesday, January 06, 2009 7:03 PM
To: [email protected]
Cc: Alexandre de Brito Matricardi
Subject: [Megaco] Fax send/receive procedures



People,

 

Could you help us in solving a question?

 

The scenario is the following:

 

Side A - Fax machine 1 -----> MG1 -----> MGC -----> MG2 -----> Side B - Fax
Machine 2

 

We are testing with 2 MGs controlled by an MGC via H.248 text (according
H.248.2)

 

First, the common voice call is setup by one side, not mattering if A or B.

 

After that, let's suppose Fax Machine 1 initializes a fax sending, pressing
Snd/Rcv button. As soon as this occur, Fax Machine 2 presses Snd/Rcv button.

Then, both MGs are reporting V.21Flag to MGC. Is it correct? 

 

Is there any possibility to distinguish which of fax machines are sending
the fax and which is receiving it? This is for avoiding the other side (fax
receiving side - Fax Machine 2) to send V.21Flag toward the MGC.

 

It's not clear on IETF H.248.2 document whether is correct or not both sides
sending V.21flag toward MGC. Could you please clarify this?

 

Thanks for your attention,

ANDRE

 



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