The network hands the P-CSCF addresses to the modem in the PDN's Protocol
Configuration Options; ModemManager's bearer code does not ask the modem
for them, qmicli (libqmi 1.39) prints none of them, and libqmi has no TLV
for the IPv6 list (0x2E), which is why PCSCF= was a required setting. A
second QMI WDS client reads them once it is bound to the bearer's mux
data port (the binding ModemManager gives its own clients): Bind Mux
Data Port, Set IP Family 6, Get Current Settings, over one AF_QIPCRTR
socket. Imsd:Qmi holds the bytes and the readers (0x22 the flag, 0x23
IPv4, 0x24 FQDN, 0x2E IPv6 in Qualcomm's layout: a count, then 16 bytes
each); imsd-pcscf is the socket, the service lookup and the sequence, and
prints the list, one address per line; nothing runs it yet. It sends
no Start Network and no Stop Network; the bearer stayed connected and the
registration stood after its runs (the fp6 journal's probe capture 04,
benches 38 and 39). The
build, the CI cross-compile, the tarball and the apk gain the product;
linux-headers is named in the sysroot for <linux/qrtr.h>.
Tested: crafter-build test, 8 passed; the aarch64 build of this commit's
helper on the dev phone (KPN) against the live ims bearer.
Crafter.Build's CI publishes a Flatpak and nothing else since
2026-10-02: the rolling `latest` release's
`crafter-build-linux-x86_64-musl-v2.tar.gz` that build-package.sh
fetched is gone (404 since 2026-10-03), so a push of a release would
fail at `fetch crafter-build` and publish nothing.
Install the Flatpak (`net.catcrafts.CrafterBuild//stable` from
flatpak.catcrafts.net) in the job container and run it as crafter-build.
bubblewrap inside the container needs a privileged runner, so the job
runs on the `flatpak` label. The sysroot stays Alpine edge and gains
llvm-runtimes, the package with the std module source of its own libc++
(libc++-dev ships none). make-sysroot.sh adds its list with --upgrade:
run over a sysroot from before this change (libc++ 22.1.8, no std module
source) a plain add installed llvm-runtimes 23.1.2 alone, and its
std.cppm did not compile against the 22.1.8 headers (`'text_encoding'
file not found`); with --upgrade libc++, libc++-dev and llvm-runtimes
came out at 23.1.2 and it compiled.
AGENTS.md §4.1, §4.3, §8.3 and §9.4 describe the route as it runs, and
the README's Building section carries the install lines. Three comments
in the files this touches said what is not so and are corrected:
package.yml had fp6-img install the package by a pinned version and
sha256 (it takes the newest in the registry), build-package.sh had
fp6-img's image build run `make check` on the aarch64 binaries (it
builds no imsd: no suite runs on them), and make-sysroot.sh's usage line
lacked the --march without which the cross build fails on an x86 host.
Tested: build-package.sh run end to end on this commit in a privileged
alpine:edge container (podman) on the workstation.
Userspace VoLTE/IMS daemon for mainline Linux phones (developed on the
Fairphone 6): a GLib-free core (SIP, SDP, USIM AKA, IPsec SA setup, RTP
media, call engine) behind a GDBus control daemon, a standalone AMR-WB
media leg, and a Plasma Dialer backend. C++26 modules built with Crafter
Build; the tree is clean under the project's house-style linter
(crafter-build lint) across all three build products.
Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
