Android's Session.sendCallSignal called the send path and threw the result
away. That result is the same Sent every other send returns - how many devices
took it, which failed - so an offer that reached NOBODY was indistinguishable
from one that rang. The caller watched "Calling..." for a signal that had gone
nowhere, and neither device had anything to say so. The same shape as the
message-loss bug fixed earlier today, on the one path where the UI never shows
a delivery banner because a call is placed from inside a WebRTC callback.
Also instruments the drops. An incoming offer can be discarded in five places
in iOS's CallManager - already-ended, older than the dial timeout, busy, wrong
state, unknown id - and every one was a bare `return`. Working out which of the
five happened costs more than the logging does. Same treatment E2EInbox.dropped
already gives ingest, and for the same reason.
Not a fix for "Android calls iOS and nothing happens" - I have not reproduced
that. It rules out and instruments: the wire shapes match, iOS builds its
CallManager eagerly at sign-in so onCallSignal is always hooked, Android sets no
from_addr so the federated fork is not swallowing it, and every clock (mac,
host, relay, db) agrees within a second so the staleness check is not
misfiring. The next attempt will say where it stopped instead of nothing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
