[Freeswitch-users] Freeswitch as VoIP-2-PSTN gateway

Tony Graziano tgraziano at myitdepartment.net
Sun Sep 19 10:11:18 PDT 2010

Typically you would use a specific type of modem (dependent upon your
connection) that has the proper chipset and driver to both connect and
control the device.

In this case, a modem is not a modem. It is a modem because it takes an
analog line in and codes/decodes it, but in sip, so it is really an analog

The more typical type of way of describing this is an in internal analog
gateway, using the ZAPTEL and other drivers. They com in different densities
and configurations. Alternately (instead of using a compatible card) you can
use an external SIP gateway. And lastly, you can connect to a provider with
a siptrunk (assuming your firewall is compatible and both firewall and nat
profiles are configured properly) and send receiev calls without the use of
a analog line.


The wiki has a list a compatible devices:


On Sun, Sep 19, 2010 at 11:46 AM, Holger von Rhein <lortas at freenet.de>wrote:

> Hi all,
> I plan to set up a VoIP/SIP switch at home. Further I'd like this switch
> to also act as gateway into PSTN.
> For this, I installed freeswitch and now I am looking around how to
> connect it to my analog USB-Modem (it's a true modem, not a winmodem) to
> FreeSwitch. By googling, by reading the documentation and the
> mailinglist, I came to the implication that it is not supported by
> FreeSwitch to be a PSTN-gateway via an analogue modem. I will need an
> external PSTN-2-SIP-gateway.
> Is my implication correct? If yes, will this change in future?
> Does anyone have some hints for me, how to get a cheap solution? (Its
> juts for home-use)
> Is it correct, that in case of an ISDN-modem freeswitch is able to be a
> PSTN-gateway?
> Kind Regards,
> Holger
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Tony Graziano, Manager
Telephone: 434.984.8430
sip: tgraziano at voice.myitdepartment.net
Fax: 434.984.8431

Email: tgraziano at myitdepartment.net

LAN/Telephony/Security and Control Systems Helpdesk:
Telephone: 434.984.8426
sip: helpdesk at voice.myitdepartment.net
Fax: 434.984.8427

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