Useful to have a gateway for some specific host or subnet to route it to. Like adding that thing on your IRC server's routing table for 0.0.0.0 and your chat server talks over the internet over that modem.
I used to have one of those awful little voip boxes when I used a discount ISP. The problem was that the router (built in I think...) would disconnect and reconnect clients every hour for some reason so it was worse than useless, but the ISP didn't support putting the voip box behind a router (they wouldn't tell you what ports and protocols to forward). Luckily for me their authentication process involved connecting to a server that served up a plaintext xml file to the device which included the credentials to log in to the box and see all the settings. Derp. That ISP is out of business now.
nowadays they do that with cable modems, I have a Netgear router that only accepts internet connections from a Coax. Hoping to open and mess with it's insides, and potentially get something like OpenWRT on there.
That's a really odd sounding handshake. 0:30 - 0:34 sounds like the first stages of a V.34 handshake and then at 0:34 it jumps to a V.22bis(?) handshake as if nothing happened.
What you're hearing is the V.8 automated answer sequence. It was introduced at the same time as V.34 and involves both modems telling each other what modes they support so they can use the highest speed mode they both support. Whoever filmed this used the +MS command to set the highest speed to 2400bps / V.22bis (since getting higher bitrates to work over VOIP can be tricky). In this case, an initial V.8 handshake is still used but essentially involves one of the modems saying "I'm only allowed to connect using V.22, so we gotta use that", at which point both modems proceed to connect using the slower modulation method.
As someone who worked on digital faxing over a digital to analog phone system, I can tell you if absolutely does weird things over voip and the experts the big companies pay tons of money to to make it work also don't seem to be able to make it not jankey. At this point I accept that fax is archaic and we shouldn't be using it anymore, but good luck getting govt and medical to realize this...
Looks alot like my old Courier HST 14400 (which costed me over 500 bux with sysop deal in 1991). I have sent fax through magicjack before without problems, had to play around with settings a bit though.
Hey I just did a setup like this but without a SIP (VoIP) provider. I just configured the dial plan to "call" the local loop back IP address on the other port if it goes off hook. This sorta works. But one thing I was hoping to do was to trick the modem into thinking that it's dialing a number. With my setup I get no dial tone at all, and I have to manually answer with the other modem in a terminal program using the ATA command. This is because the line starts to ring as soon as the modem goes off hook. It seems like it's not possible to get a dial done unless I have a VoIP service connected to the PAP2T. Got any info on this. Cheers.
Maybe you're still interested. This one: www.instructables.com/id/Hack-a-VOIP-Box-Into-a-Telephone-Intercom/ And this one: www.instructables.com/id/VOIP-Phone-AND-intercom-system/ This realy helped me out. Keep sure to have nothing in the "Restricted Access Domains: - Field" in the System section of your linksys gui.
@@cosimocosner14 Hey thanks so much for this. Very interesting. Will be going through this to see if I can improve my baud rate a little. 31200 is a bit... poky, but honestly even if I could get the theoretical max a modem could reasonably do over POST it would still be super slow by today's standards. Cheers!
You can make the dial tone anything you want and also you can set up a number that needs to be dialed to get to another sip box (or port on a PAP2T) on your local network, it really doesn't work over 2400 baud online due to the nature of the internet but you could achieve greater speed on a local network possibly even 48 baud. Make sure to use G711 as other codecs try to compress the data stream. You can even connect the telephone ports of 2 modems with a patch cable (RJ11) and it will work as modems generate their own line voltage.
man I tried exactly the same setup, spent good 4 days playin with it and got it completely unstable at 1200. how the hack did you get it stable at 2400, no idea.
