Having thought about the idea form time to time, how about using the Onion as a IO borad that comunicated via USB to a better unit thats doitn the actual SIP and stuff?
But how do i get the dialed Numbers over the the host?
using Serial seams the usefullest.
I guess the Host will be Intel-NUC to be able to run a "good" OS on it and to have other capabilities as well.
Ideas to this new way to solve the problem?

hm, thats not what i expected, but yeah as it look its not possilbe. woudl have been cool to have a old phone with ringdial and have full SIP compatibility.

Thanks for the help anyways

So better take a Raspi or an alternative?

I looked at a USB audio card. woudl that be an option?

Hey Tinkerers.
Im trying to setup a SIP client on a "old" Onion Omega 1 (the first ones). Also i have a rotary dial also that i want to hook up. Now im looking for a way to achieve that. I have little to none electronic skills, neither programming :-).
I guess the rotary needs to get read out by a edge detection.
Bell ringing i guess can be done with a relais.
But i have no idea how to get a SIP client installed. Did some one Try that already?

compiled my own package and kill'd my onion
the instruction (in corss-compile tutorial @ Step 7) is saying something of downloading a image?
with some trying i managed to rescue it by loading it on a USB and copy it to the /tmp folder and re "sysupdate" it to the actual omega build.

so @Boken-Lin i can run the unpacked CUPS packages from the USB drive? or do i still need to selfcompile the build to get the openwrt packages to run the server plus work with the printer?

got actually the cross compile environment. since i'll use one of my onion's as a CUPS printer server and the packages don't have the "cups" installed from beginning, i need to compile the whole thing.
and also as the omega just has a small amount of storage, i need it to run it from a USB-stick. As there are no utils to mount a stick at boot, i need to make a custom image, or am i wrong?