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+# D-Modem
+Software modem with **sound**  
+For burble's retro voip modem https://burble.dn42/retro/modem/  
+Fortunately this old proprietary software modem still works :)
+
+## Prerequisite
+- A desktop GNU/Linux distribution, livecd is also OK
+- See the original README
+- 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.
+
+## Step-by-step instruction
+
+Execute these commands as a normal user:  
+
+```
+make
+./slmodemd/slmodemd -e ./d-modem
+screen /tmp/ttySL0 115200
+```
+
+Inside the serial console, use the following at commands:  
+
+```
+>atx3
+OK
+>at+ms=22,0,1200,1200
+OK
+>atd424026019@voip.burble.dn42
+...
+```
+
+Now you should be connected. See https://burble.dn42/retro/modem/ for login username and password. Once logged in, close out of screen and execute pppd like this:  
+
+```
+sudo pppd $(readlink /tmp/ttySL0) 1200 user dn42 noauth nodefaultroute nodetach
+```
+
+nodefaultroute is used here to keep your voip alive :)  
+
+## netns
+If you would like a full dialup dn42 experience, try using netns:  
+
+```
+sudo ip netns add modem
+sudo ip netns exec modem pppd $(readlink /tmp/ttySL0) 1200 user dn42 noauth nodefaultroute nodetatch
+```
+
+Start a new terminal and  
+```
+sudo ip netns exec modem $SHELL
+unshare -m
+echo 172.23.0.53 > /tmp/resolv.conf
+mount --bind /tmp/resolv.conf /etc/resolv.conf
+ping burble.dn42
+```
+
+Have fun!