58 lines
1.4 KiB
Markdown
58 lines
1.4 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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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=22,0,1200,1200
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OK
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>atd424026019@voip.burble.dn42
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...
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```
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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:
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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 user dn42 noauth nodefaultroute nodetatch
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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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