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Equitel E451 Manual de usuario Pagina 21

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October 2013 – Ed.1.0
EQUITEL E400 Family – Control and communications protocol
Page 18
2.1.3.3. KEEPALIVE message
This is the message that the controller sends to maintain the communication established with E400.
Address: CC E400
Syntax: Command
:
KEEPALIVE
Parameters: None
Once a connection between the controller and the E400 unit has been established, and the use of this
command has been configured, the E400 devices wait to receive messages from the controller at a
lower rhythm than the configured expiry time.
Should E400 not receive them, it understands that there has been a communications failure, so it
closes the connection socket and opens a new one waiting for the controller to connect again.
It should be pointed out that configuring the use of “Keep-Alive” does not force the system to send
always this message to update the time counter: any message will refresh the time. For example, if in
the central there is a status query programmed (QRYSYSINFO) every 10 minutes and the “Keep-Alive”
is configured for 15 minutes, the counter controlling the communication socket will never expire.
The answer of E400 to this message will be ACK_KEEPALIVE.
2.1.3.4. ACK_KEEPALIVE message
This is the message that E400 sends back to the controller, as the answer to a KEEPALIVE.
Address: E400 CC
Syntax: Command
:
ACK_KEEPALIVE
Parameters: None
2.1.3.5. PLAYTONE message
The family of E400 devices have available three configurable audio messages:
calling.pcm:
Proprietary mode: it is played when the call query has been correctly received in the control
centre.
SIP/P2P-SIP mode: it is played when the call has progressed correctly and it has been received by
the intended recipient.
ring.pcm:
SIP/P2P-SIP mode: it is played when E400 receives an incoming call query.
offline.pcm:
It is played to indicate a failure in any of the three available working modes.
We can play any of these audio prerecorded messages through this command.
Address: CC E400
Syntax: Command
:
PLAYTONE
Parameters: Message to play (0: calling, 1: offline, 2: ring)
Example: PLAYTONE 1&
As an answer, E400 will send the message ACK_PLAYTONE OK if the message has been successfully
played, otherwise ACK_PLAYTONE NOK.
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