[asterisk-users] Virtual or Hardware SIP Modem

[Steve Davies]

You can get much better results (close to 56k reliable connections
sometimes) by using a Xorcom FXO Channelbank - You need recent enough
drivers so that the Xorcom internal clock can be synced to Zaptel;
This removes/reduces jitter and frame slippage, and allows a modem to
operate much more reliably.

Regards,
Steve

On 02/04/2008, Don Fanning <don at 00100100.net> wrote:
> Short answer: No.
>
>  However you can use ATA devices like PAP-2's to connect to your existing
>  modem bank and as long as your latency is constant, get decent results.
>  I myself have gotten 33.6k on a regular basis with such a setup and have
>  called the world using cheap SIP/IAX providers with decent speeds.
>
>  The key to note is that you disable Data Compression (AT&K0) because the
>  data stream is already compressed.  Error correction however is useful.
>
>
>
>  Kyle Gibbons wrote:
>  > Hi,
>  >
>  > I have just gotten my first Asterisk box up and running, and it is
>  > running great. I am working on this project with the plans of possibly
>  > implementing it in a business environment. The problem I am coming up
>  > against is that the business I am planning on implementing this setup
>  > in is using some legacy software which requires a modem to communicate
>  > with energy management systems. My question is if there is a virtual
>  > or physical SIP modem that I could possibly use so that I can
>  > interface this old software with Asterisk. There is no option of
>  > getting rid of modems all together. I would prefer not to use Zap
>  > cards or other adapters for the current modems. My goal is to
>  > completly replace the modems with software. Any help would be GREATLY
>  > appreciated. Thanks!
>  >
>  > --
>  > All the best,
>  > Kyle
>  >
>