This is just a low priority curiosity question because I have a usable workaround. I have Digium card that uses the Zaptel driver (can't get to my home machine right now to get the exact model, but it probably doesn't matter). It's a card with one POTS line and three extension hookups. I'm using Asterisk 1.4 and Zaptel 1.4.7 . One of the extension ports is connected to a modem on another computer. This is a FAX modem that works well; I have * programmed to detect incoming faxes and route them to this modem, and it works seamlessly. I can also send outbound faxes with no problem. The curiosity is that this modem does not work for dialup unless I bypass the * server and connect it directly to the wallplate, then it works fine. I don't see why it would be able to detect carrier and negotiate with a fax machine through * and Zaptel, but not with a dialup server. --Greg
Greg Woods wrote:> This is just a low priority curiosity question because I have a usable > workaround. > > I have Digium card that uses the Zaptel driver (can't get to my home > machine right now to get the exact model, but it probably doesn't > matter). It's a card with one POTS line and three extension hookups. I'm > using Asterisk 1.4 and Zaptel 1.4.7 . > > One of the extension ports is connected to a modem on another computer. > This is a FAX modem that works well; I have * programmed to detect > incoming faxes and route them to this modem, and it works seamlessly. I > can also send outbound faxes with no problem. > > The curiosity is that this modem does not work for dialup unless I > bypass the * server and connect it directly to the wallplate, then it > works fine. I don't see why it would be able to detect carrier and > negotiate with a fax machine through * and Zaptel, but not with a dialup > server. > > --GregI think asterisk has the ability to detect fax tones and disable echo cancellation for those calls. I don't know if that is the case with a regular modem call. I'd check to make sure that echo cancellation is disabled on the extension the modem is plugged into. The only other idea is to try connecting at a lower speed (I would think this would happen automatically though). -Dave