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sip: log a refused REGISTER or SUBSCRIBE with its status line and reason headers

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A refused final was logged as its bare status code ("re-REGISTER failed
503", "reg-event SUBSCRIBE -> 500") — the unprotected REGISTER's as
"expected 401", without even the code — so a field journal could not say
which node refused or what it said. O2 UK answered a phone's 30-minute
refresh with 503 twenty-one times over seventy minutes and then refused
a fresh registration's reg-event SUBSCRIBE with 500 (alyx, 2026-09-24);
the journal holds nothing but the numbers.

Log the status line with the headers that carry the reason —
Retry-After, Warning, Reason, Server — for a REGISTER's refused final
(initial, protected, refresh) and for a refused SUBSCRIBE the run loop
reads, and dump the refused message under DUMP_SIP as its own fail dump
next to the 200s.

To tell a REGISTER's final from what else arrives, the final is now
matched by Call-ID and CSeq, and a request that arrives on the client
flow while one is awaited is dispatched: a refresh no longer reads such
a request as a failed REGISTER. An INVITE among those requests is a call
like any other, announced on the bus: a Dial whose reconnect it arrived
under meets the call-in-progress rule again before it places its own,
and when a resume, a refresh or a reconnect fails the call that arrived
under it ends with the flow it came in on (486 while the flow still
carries one, and the bus told). The unprotected REGISTER's reply is
matched the same way on the init port.

Tested on the dev phone (KPN) in builds of this series; not every path
has run there.
This commit is contained in:
Jorijn van der Graaf 2026-09-24 18:51:03 +02:00
commit 46bf363915
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
4 changed files with 212 additions and 45 deletions
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README.md
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@ -281,7 +281,7 @@ PCSCF=2001:db8::105
| `RTP_PORT` | `50004` | local RTP port advertised in SDP |
| `PRECOND` | `0` | `1` offers SDP QoS preconditions |
| `CODECS` | *(empty — defaults)* | comma-separated codec preference list over `AMR-WB`, `AMR` (or `AMR-NB`), `PCMA`, `PCMU`: restricts and orders both the codecs offered on an outgoing call and those accepted from an inbound offer (default: offer AMR-WB + AMR, accept all four in that order). A bench knob — a network whose gateway transcodes every caller up to AMR-WB otherwise never lets the narrowband path run |
| `DUMP_SIP` | `0` | `1` writes raw REGISTER-200/SUBSCRIBE-200 dumps, the last inbound INVITE (`imsd-invite-in.raw`) and the last outgoing INVITE (`imsd-invite-out.raw`), mode 0600, for debugging — they contain your IMSI/MSISDN and addresses |
| `DUMP_SIP` | `0` | `1` writes raw REGISTER-200/SUBSCRIBE-200 dumps, the last refused REGISTER or SUBSCRIBE final (`imsd-register-fail.raw`, `imsd-subscribe-fail.raw`), the last inbound INVITE (`imsd-invite-in.raw`) and the last outgoing INVITE (`imsd-invite-out.raw`), mode 0600, for debugging — they contain your IMSI/MSISDN and addresses. A refused REGISTER, and a refused SUBSCRIBE final the run loop reads, are logged with the status line and any Retry-After / Warning / Reason / Server headers |
| `DUMP_DIR`, `OUT_DIR` | state dir | where dumps / per-call media stats land |
| `IMSD_MEDIA` | *(auto)* | path to `imsd-media` (default: next to `imsd`, else `/usr/libexec/imsd-media`) |