calculateRemoteAnswerTime method
Calculates the time for remote side to answer (outbound calls). This is from invite sent to call answered.
Implementation
int? calculateRemoteAnswerTime(String callId) {
final state = _callTrackers[callId];
if (state == null) return null;
final inviteSent = state.milestones[milestoneInviteSent];
final callAnswered = state.milestones[milestoneCallAnsweredByRemote];
if (inviteSent == null || callAnswered == null) return null;
return callAnswered - inviteSent;
}