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don at 00100100.net
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 Posted: Tue Apr 01, 2008 8:33 pm Post subject: [asterisk-users] Virtual or Hardware SIP Modem |
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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:
| Quote: | 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
bobert5064.deviantart.com <http://bobert5064.deviantart.com>
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davies147 at gmail.com
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| Posted: Wed Apr 02, 2008 5:09 am Post subject: [asterisk-users] Virtual or Hardware SIP Modem |
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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:
| Quote: | 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:
| Quote: | 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
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