Equitel E451 Uživatelský manuál stáhnout pdf (Strana 30)

October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 27

In summary, it is the one in charge of establishing the sessions and putting in contact one link with

another in communication.

In the example of IP telephony, the registrar and SIP servers are within the same element, normally the

SIP switchboard or PBX.

VoIP Gateway

When elements of different technologies are to interface, we have to use Gateways.

For example, a Gateway may serve as the link between a VoIP network and a public switched telephone

network to make calls between analogue and IP telephones.

Once again, in the typical application of IP telephony, this element lies within the PBX.

4.2 SIP implementation in the modules E401 and E451

For the purposes of the SIP protocol, the modules E401 and E451 behave as user agents as any IP telephone

would do.

In EQUITEL IP intercom systems we have implemented a part of the SIP protocol to make a simple

functionality of answering an incoming call, and a push-button based call request, associated to an available

input.

Next we will show a simple network that will serve as the base to explain more in detail how to use the SIP

protocol in our intercom systems.

Figure 13. Basic network for using the SIP protocol

SIP mode with PBX

Both modules can register with the PBX, in which we have to configure a specific extension for each one

of the E401 or E451 we wish to use.

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Equitel E451 Uživatelský manuál Strana 30