Parameter: Early Media Relay and Ring Tone Generation: Ring Tone Starting State
From TBwiki
Call state when the ring tone is started (if required) on the incoming call leg.
- Immediately: Ring tone starts immediately on an incoming call.
- Call Accepted: Ring tone starts on an incoming call once the outgoing call is accepted.
- Call Progress Received: Ring tone starts on an incoming call once 'Call Progress' is received on the outgoing call.
- Call Alerted: Ring tone starts on an incoming call once the outgoing call is alerted.
Notes:
- It is not common to start a ring tone before the call is alerted because it indicates that the remote phone is ringing, and that is only confirmed with an 'alerted' state.
- A ring tone that is started before the call is alerted may be replaced by early media from the outgoing call if later alerted with early media.
