[Freeswitch-dev] Using a modem to connect ordinary phones

Alex To tonhudung at gmail.com
Tue Oct 27 22:37:07 PDT 2009

Thank you very much for your prompt reply Mike


The problem is I could simply get everything working by buying a zaptel
compatible card or a VoIP Gateway. However I would like to use the modem
that I am developing since it does provides some additional features. 


Does that mean I could start my way reading about Zaptel and develop a
modified version of Zaptel to control my modem ?


Thanks for pointing me the way.




Alex To


From: freeswitch-dev-bounces at lists.freeswitch.org
[mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Michael
Sent: Wednesday, October 28, 2009 1:23 PM
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] Using a modem to connect ordinary phones


You are better off creating a zaptel driver than re-creating all that work
that has already been done.




On Oct 28, 2009, at 1:05 AM, Alex To wrote:



I found the same topic created 2 years back in Oct 2007 but it doesn't seem
to have the answer yet.


 I am quite new to FS and having a hard time reading the documentation.
Someone could tell me: how would I use a modem and develop an Endpoint in FS
that I could bridge the call from VoIP to PSTN. I am a hardware engineer, I
am developing this modem and would want to use it with FS. I know that I
could simply buy a VoIP Gateway or a zaptel compatible card and use OpenZap.


Could someone point me out the direction for the following matters:


1.       I feel that I need to develop an Endpoint module, like mod_sofia,
mod_iax... that controls my modem so I could bridge the call from VoIP to
PSTN ? If that is correct, could someone point me the documentation to start
reading about Endpoint interface .?

2.       Is there any similar module developed before about controlling a
modem using AT Command


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