While the Sangoma developers are busy solving important problems, I decided to solve a problem that no one has: how can I administer my PBX over RTP streams?
In case you would like a softmodem for asterisk for any reason, you can find the module here: GitHub - billsimon/asterisk-Softmodem: V.23 Softmodem for Asterisk with some Bildschirmtext-specific stuff in it.
It uses Steve Underwood’s popular and versatile spandsp library. Did you know spandsp has data modems as well as fax modems?
ps: no, I’m not actually going to use this to administer my PBX.