SipCallStatus:
| "initiated"
| "ringing"
| "missed"
| "not-answered"
| "failed"
| "incoming"
| "verified"
| "rejected"
| "abandoned"
| "answered"
| "ended"
| "transfer-initiated"
| "transfer-accepted"
| "transferring"
| "transfer-ringing"
| "transferred"
| "transfer-failed"
| "switch-room-initiated"
| "switch-room-completed"
| "switch-room-failed"
Call lifecycle status.