[Asterisk-Users] fax receive using TDM400P

[Steve Underwood]

If you need to play with gains to make rxfax work something is broken in 
your setup. It could be your echo canceller is not turning off as the 
fax begins. fax modems normally work just fine over a wide range of 
signal levels.

Steve


Anton Krall wrote:

>Also one question. Do you still have to play with gains when using iaxmodem
>as you need to when using rxfax? 
>
>|-----Original Message-----
>|From: asterisk-users-bounces at lists.digium.com 
>|[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
>|Administrator TOOTAI
>|Sent: Saturday, February 25, 2006 7:07 AM
>|To: Asterisk Users Mailing List - Non-Commercial Discussion
>|Subject: Re: [Asterisk-Users] fax receive using TDM400P
>|
>|Anton Krall a écrit :
>|
>|>Why is iaxmodem with hylafax more stable than spandsp?
>|>
>|>Can you run iaxmodem and hylafax together with spandsp (for 
>|running E1 
>|>r2mfc)?
>|>  
>|>
>|You're mixing thinks: iaxmodem+hylafax is equivalent to 
>|rx_fax/tx_fax, both are based on spandsp which is the library.
>|
>|>|-----Original Message-----
>|>|From: asterisk-users-bounces at lists.digium.com
>|>|[mailto:asterisk-users-bounces at lists.digium.com] On Behalf 
>|Of Rob Danz
>|>|Sent: Friday, February 24, 2006 9:34 AM
>|>|To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
>|>|Subject: RE: [Asterisk-Users] fax receive using TDM400P
>|>|
>|>|I wrestled with this for a long time, as have many others 
>|and it just 
>|>|doesn't work with spandsp and asterisk alone.
>|>|
>|>|Use iaxmodem and hylafax in conjunction with asterisk... it 
>|works like 
>|>|a champ.  I have a single POTS line coming in so I get voice & fax 
>|>|with a single number using fax detect.
>|>|
>|>|http://iaxmodem.sourceforge.net/
>|>|
>|>|
>|>|
>|>|-----Original Message-----
>|>|From: Rich Adamson [mailto:radamson at routers.com]
>|>|Sent: Friday, February 24, 2006 7:28 AM
>|>|To: Asterisk Users Mailing List - Non-Commercial Discussion
>|>|Subject: Re: [Asterisk-Users] fax receive using TDM400P
>|>|
>|>|> Ive been testing how to receive faxes using TDM400P cards and so 
>|>|> far,
>|>|after
>|>|> playing with gains, echocancell and echotraining on
>|>|zapata.conf.. Ive
>|>|> ha
>|>|dno
>|>|> luck, faxes come in as garbage or broken or with blank lines.
>|>|> 
>|>|> Anybody has successfully done this? Any tips.. Also I have
>|>|some ideas:
>|>|> 
>|>|> 1. Is it really possible to get fxes on a fax machine using
>|>|ATAs like
>|>|> the sipura 2002? Even using ulaw and pass-thru, is it possible?
>|>|> 
>|>|> 2. Since the faxes is coming from PSTN thru the card, I
>|>|guess asterisk
>|>|will
>|>|> always stay in the middle right? No way around this.
>|>|> 
>|>|> 3. Im also trying to receive faxes usign a TE110P card 
>|with spandsp,
>|>|unicall
>|>|> and E1 R2MFC, no luck also, some stuff, garbage and broken faxes. 
>|>|> Anybody done this sucessfuly?
>|>|> 
>|>|> Hope anybody can share their thoughts and insight on this.
>|>|
>|>|Using the TDM400 card for any form of fax'ing (or modem use) is well 
>|>|known to be unreliable and, in most cases, totally unusable. 
>|The issue 
>|>|has been discussed many times over the last two years or so. 
>|There are 
>|>|no known workarounds.
>|>|
>|>|Its my understanding that lots of folks have spandsp working via T1 
>|>|and/or PRI interfaces. The issues associated with the TDM400 card do 
>|>|not apply to the T1 cards.
>|>|
>|>|
>