Equitel E451 Manual de usuario descargar pdf (Pagina 9)

October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 6

Chapter 2. IP intercom systems communications structure

EQUITEL IP intercom systems support three independent alternatives or working modes to implement the

functionality of IP communication.

Parallel to the chosen working mode for the audio communication, a management software implementing

EQUITEL proprietary protocol is necessary, to remotely manage the auxiliary inputs and outputs of the modules

E401 and E451.

SIP mode with PBX

As we will explain in Chapter 4, E401 and E451 can be configured in this mode since they include a SIP agent that

allows them to register in any PBX supporting this protocol, and make and/or receive calls through it.

The use of a controller is optional in this mode, although with its presence it is possible to supervise the calls

made through the SIP protocol, in order to register them.

Mode P2P-SIP

In the very same Chapter 4 we describe how to configure the units E401 and E451 to use the SIP protocol

without the need of a PBX. In this case we have to take into account that we lose the supervision function

performed by a PBX over the links, such as calls transfers, expiry time,…

Propietary mode

The communication establishment is done by an EQUITEL proprietary protocol. In this chapter, we will explain it

in detail.

Apart from the audio communication establishment, the use of this protocol allows adding particular

functionalities to these systems such as: register of events (alarms, calls, etc.), and have knowledge of its status

at every moment, even if we use SIP for the communication establishment.

This protocol is basically the result of encapsulating in TCP packets some simple messages for commands and

answers.

As far as this protocol is concerned, EQUITEL intercom systems behave as servers, accepting a connection in the

port 7000.

As to vocal communication itself, EQUITEL has chosen to use the codec G711-A encapsulated by the RTP

protocol, due to its compatibility and ease of implementation.

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Equitel E451 Manual de usuario Pagina 9