I am using Mod lua for call processing on the FreeSwitch. I would like to wait for some events such as CHANNEL_ANSWER and CHANNEL_HANGUP  in order to get the answer time and hangup time. Basically, something like

Wait for event CHANNEL_ANSWER or CHANNEL_HANGUP

If (event_name = “CHANNEL_ANSWER”) then answer_timestamp = getHeader(“Caller-Channel-Answered-Time”)

If (event_name = “CHANNEL_HANGUP”) then hangup_timestamp = getHeader(“Event-Date-Timestamp”)

The session:getState() described in module lua gets the call state but not the channel state. For instance, ‘CS_EXECUTE’ is the channel state when it is executing a dialplan not when the call is answered.

Is there a way to wait for channel events such as CHANNEL_ANSWER and CHANNEL_HANGUP in order to retrieve answer and hangup timestamps for a call?

Any input is very much appreciated.

Thanks.

Sam