User manual

October 2013 – Ed.1.0
EQUITEL E400 Family – Control and communications protocol
Page 20
2.1.4. Communications supervision SIP
If we configure the module E400 in any of the working modes using the SIP protocol (SIP with PBX or P2P-
SIP), we can implement a VoIP network without needing any controller.
However, optionally we can add a controller to the network with the task of supervising the calls (to
register them), and to control the auxiliary inputs and ouputs.
2.1.4.1. DEMCALLSIP message
When using the SIP protocol, this message is sent from the module E400 to the control centre to
indicate that the user call button has been pressed.
Address: E400  CC
Syntax: Command
:
DEMCALLSIP
Parameters: None
When a module E400 sends this message, it waits to receive the corresponding ACK.
2.1.4.2. ACK_DEMCALLSIP message
This is the message that the controller has to answer to E400 in response to a DEMCALLSIP command.
Address: CC  E400
Syntax: Command
:
ACK_DEMCALLSIP
Parameters: None
2.1.4.3. OUTCALLRINGING message
This is the message sent from a module E400 to indicate that the intended recipient has received a call
query, through the SIP protocol, and it is waiting for it to pick up and establish the audio
communication.
Address: E400  CC
Syntax: Command
:
OUTCALLRINGING
Parameters: Callee extension
Example: OUTCALLRINGING 1040&
After sending this message, E400 waits to receive the corresponding ACK_OUTCALLRINGING.
2.1.4.4. ACK_ OUTCALLRINGING message
This is the message that the control center has to answer as a response to the message
OUTCALLRINGING.
Address: CC  E400
Syntax: Command
:
ACK_OUTCALLRINGING
Parameters: None