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Jorijn van der Graaf 2026-08-12 14:25:09 +02:00
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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 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 userspace instead: SIP registration with USIM AKA authentication over kernel
IPsec (ESP), call signalling, and the AMR-WB RTP media plane wired into 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. calls on a commercial network.
## Status ## 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 modem on a mainline kernel with working WWAN/MM integration, kernel ESP
(`ip xfrm`), and PipeWire for audio. (`ip xfrm`), and PipeWire for audio.
Everything below has been verified on exactly **one device / one carrier** Everything below has been verified to be fully workking:
(n=1) — reports from other combinations are very welcome:
| Device | OS | Modem | Carrier | Status | | Device | OS | Carrier
|---|---|---|---|---| |---|---|---|
| Fairphone 6 (SM7635 "milos") | postmarketOS, mainline kernel | Qualcomm (QRTR/QMI) | KPN NL (eSIM) | MO + MT calls, full-duplex AMR-WB | | The Fairphone (Gen. 6) | postmarketOS, Linux 7.1.2 | KPN NL |
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.
## Build ## Build