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October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 12

Example: STARTAUDIO 192.168.1.10/66000&

Within the message data, the controller indicates to the E400 to which IP address and port the RTP

audio packets must be sent.

This IP address does not have to be the controller’s. It can be any other element within the network

capable of receiving coded RTP audio according the standard G.711-A and decode it.

Every time that E400 receives this order, it sends the corresponding ACK_STARTAUDIO OK back, and it

activates its audio circuits and RTP packets transmission and reception for a maximum of 2 minutes.

In case of not being able to activate the audio, the controller will receive ACK_STARTAUDIO NOK.

The E400 module port to which the RTP packets must be sent is 30000.

If it is required the audio to be activated for more than 2 minutes, the controller must periodically

resend the command STARTAUDIO to refresh it.

This is done to avoid the E400 module to remain with the audio permanently activated should the

controller not close it due to any mistake.

This message can be sent to the equipment at any moment, even if there is not a previous call query.

2.1.1.6. ACK_STARTAUDIO message

This is the message that the contoller has to send back to the module E400 as an answer to a

STARTAUDIO message.

Address: E400  CC

Syntax: Command

ACK_STARTAUDIO

Parameters

Command result(OK/NOK)

E400 indicates in the message whether it has been possible to open correctly the audio (OK) or not

(NOK).

2.1.1.7. STOPAUDIO message

This is the message that a controller sends to deactivate the audio transmission and reception in E400.

Address: CC  E400

Syntax: Command

STOPAUDIO

Parameters: None

When E400 receives this order, the RTP packets delivery stops; it closes the audio circuits and sends

the corresponding message to the controller: ACK_STOPAUDIO CLOSED.

If when receiving the command the audio was already closed, it is sent the previous ACK. However, if it

has not been possible to deactivate the audio, the message ACK_STOPAUDIO NOCLOSED is sent back.

2.1.1.8. ACK_STOPAUDIO message

This is the answer of E400 to the command STOPAUDIO.

Address: E400  CC

Syntax: Command

ACK_STOPAUDIO

Parameters

Audio status (CLOSED/NOCLOSED)

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