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

[Giovanni Maruzzelli]

On Wed, Oct 28, 2009 at 6:37 AM, Alex To <tonhudung at gmail.com> wrote:
> 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.
>

It depends on how your modem behave...

Eg: in the past I developed a channel driver that was using
voicemodems and ALSA to interface with PSTN: AT command for call
control and ALSA for audio I/O.

If you are in this situation (your modem accept AT commands, and has a
way to do audio I/O through ALSA or some other interface), then maybe
you would like to wait a little bit until I release a new endpoint for
FreeSWITCH that do this for GSM, and just use that endpoint with
little or no customization.

-giovanni





>
>
> 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.
>
>
>
> Regards
>
>
>
> Alex To
>
>
>
> From: freeswitch-dev-bounces at lists.freeswitch.org
> [mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Michael
> Jerris
> 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.
>
>
>
> Mike
>
>
>
> On Oct 28, 2009, at 1:05 AM, Alex To wrote:
>
> Hi,
>
>
>
> 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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>



-- 
Sincerely,

Giovanni Maruzzelli
Cell : +39-347-2665618