search for: nvdetect

Is there a built-in way of detecting fax tones, or a switch to T.38 on a SIP channel? I need to periodically check some efax servers for availability and figured the best way to ensure they are operational is to check for tones. I've looked into Nvdetect but the company seems to have gone out of business and I don't want to be stuck with a solution that won't make it through an upgrade of asterisk. My ITSP supports T.38 and should send a Re-Invite so is there a way to just set a channel variable when it sees this and use that as an indicato...

My boss is insisting we support fax, and I keep telling him that Fax over IP is very unreliable and not recommended and his immediate come-back is "Vonage does it." and it's very hard to figure out how. I don't think Vonage does T.38, the Linksys/Sipura units they're using doesn't support T.38 to my knowledge. That means they have to be using G.711Ulaw to send faxes.