76 lines
2.2 KiB
Markdown
76 lines
2.2 KiB
Markdown
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# D-Modem
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Software modem with **sound**
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For burble's retro voip modem https://burble.dn42/retro/modem/
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Now also for JerryXiao's own software voip modems!
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Fortunately this old proprietary software modem still works :)
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## Prerequisite
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- A desktop GNU/Linux distribution, livecd is also OK
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- See the original README
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- Modem without any sound isn't a real modem? No problem, pulseaudio is used to output modem sound in realtime. You must have pulseaudio dev package installed on your system to compile this software.
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## Step-by-step instruction
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Execute these commands as a normal user:
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```
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make
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./slmodemd/slmodemd -e ./d-modem
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screen /tmp/ttySL0 115200
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```
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Inside the serial console, use the following at commands:
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```
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ATX3
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> OK
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AT+MS=22,1
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> OK
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ATD424026019@voip.burble.dn42
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> CONNECT 1200
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```
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You can also connect to:
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| number | AT+MS | ATD | Modulation |
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| ------------ | ------------ | ------------ | ------------ |
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| (42403618)361800 | AT+MS=90,1 | ATD361800@pbx.jerry.dn42 | V.90 |
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| (42403618)361801 | AT+MS=34,1 | ATD361801@pbx.jerry.dn42 | V.34 |
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| (42403618)361802 | AT+MS=34,1 | ATD361802@pbx.jerry.dn42 | V.34 |
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| (42403618)361803 | AT+MS=22,1 | ATD361803@pbx.jerry.dn42 | V.22 |
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| (42403618)361804 | AT+MS=22,1 | ATD361804@pbx.jerry.dn42 | V.22 |
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| (42403618)361805 | AT+MS=23,1 | ATD361805@pbx.jerry.dn42 | V.23 |
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| (42403618)361806 | AT+MS=23,1 | ATD361806@pbx.jerry.dn42 | V.23 |
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Now you should be connected. If you see a login prompt, go to https://burble.dn42/retro/modem/ for login username and password. Once logged in, close out of GUN Screen and execute pppd like this:
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```
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sudo pppd $(readlink /tmp/ttySL0) 1200 user dn42 noauth nodefaultroute nodetach
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```
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nodefaultroute is used here to keep your voip alive :)
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## netns
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If you would like a full dialup dn42 experience, try using netns:
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```
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sudo ip netns add modem
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sudo ip netns exec modem pppd $(readlink /tmp/ttySL0) 1200 noauth nodefaultroute nodetach
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```
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Start a new terminal and
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```
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sudo ip netns exec modem $SHELL
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unshare -m
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echo 172.23.0.53 > /tmp/resolv.conf
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mount --bind /tmp/resolv.conf /etc/resolv.conf
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ping burble.dn42
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```
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Have fun!
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## Server
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This code can also work as a server, no docs available though ;)
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Just type ATA in the modem console and try it out first.
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