@intelfx says that if in DnD mode, incoming calls are rejected

not even giving user a chance to answer using any other device

Start by reproducing an incoming call on iOS while Do Not Disturb mode is enabled, then trace the incoming-call handling to determine whether the user can answer from another device. Done means the behavior is confirmed and the expected cross-device answering opportunity is preserved, with a regression test or documented reproduction if the project supports one.

Written by the indexing model from the issue text.