What a pain. Whisperfish is able to use the contacts (tested), so you might be able to copy it.
Indeed. But since the phonebook numbers do contain spaces, s1p should strip them, (or warn of an invalid number)
I’ll send them a quarter of dolly mixture.
but while we are waiting…
It happened on long calls that had several dropouts (call has no audio for n seconds, then resumes), but not on short calls.
Since this is also what happens when you put a space into the number, then ensuring that the hangup can still work in that case, might fix the other case. [Closing s1p and restarting it resumes operation OK]