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Jorijn van der Graaf 2026-08-12 14:25:09 +02:00
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README.md
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@ -12,7 +12,7 @@ Modem firmware on typical mainline-Linux phones will bring up the IMS PDN but
can't be used for actual call audio. imsd implements the whole IMS client in
userspace instead: SIP registration with USIM AKA authentication over kernel
IPsec (ESP), call signalling, and the AMR-WB RTP media plane wired into
PipeWire — so a stock Plasma Mobile dialer can place and receive real VoLTE
PipeWire so a stock Plasma Mobile dialer can place and receive real VoLTE
calls on a commercial network.
## Status
@ -71,17 +71,11 @@ AKA via a UIM logical channel), so in practice it currently needs a Qualcomm
modem on a mainline kernel with working WWAN/MM integration, kernel ESP
(`ip xfrm`), and PipeWire for audio.
Everything below has been verified on exactly **one device / one carrier**
(n=1) — reports from other combinations are very welcome:
Everything below has been verified to be fully workking:
| Device | OS | Modem | Carrier | Status |
|---|---|---|---|---|
| Fairphone 6 (SM7635 "milos") | postmarketOS, mainline kernel | Qualcomm (QRTR/QMI) | KPN NL (eSIM) | MO + MT calls, full-duplex AMR-WB |
Carrier-side assumptions that held on this network but may differ elsewhere:
IPsec sec-agree with AKAv1-MD5 over IPv6, AMR-WB audio, TCP for the
protected flows. The SIP/SDP/AKA layers are carrier-agnostic and unit-tested;
the bring-up sequencing is where new networks will differ.
| Device | OS | Carrier
|---|---|---|
| The Fairphone (Gen. 6) | postmarketOS, Linux 7.1.2 | KPN NL |
## Build