So I got the directionality wrong, but it did seem to presage a call event: you heard the distinctive tones before the ring. Would you agree it's part of the r

So I got the directionality wrong, but it did seem to presage a call event: you heard the distinctive tones before the ring. Would you agree it's part of the re-initialisation sequence, even if not directly caused by the transmission infra talking to the phone?