Equitel E451 Manual de usuario descargar pdf (Pagina 6)

October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 3

telephone list in the network in constantly updated, as well as its characteristics. The most important

characteristic of a telephone that the PBX must know is its IP address, for it has to associate it to a

determined identifying name (extension name)

In the example in Figure 3 we want to associate the extension 100 to the telephone on the left side, while the

telephone on the right is going to be assigned the 200. Both telephones IP addresses have been assigned by a

DHCP server.

Both telephones must communicate their presence to the PBX as well as their IP addresses.

IP network

IP telephone

192.168.1.99

IP telephone

192.168.1.25

Switchboard (PBX)

I want to register as

extension 100.

My address is

192.168.1.25

I want to

extension 200.

My address iss

192.168.1.99

Accepted Accepted

Figure 3. VoIP. Register in the PBX

Both of them send a message to the PBX indicating that they wish to register with the configured extension

name and IP address. Should the PBX accept this register, it will send an acknowledge message back.

For a telephone to register in a PBX, it must have configured the PBX address, the corresponding extension

name and, usually, an access code. This way, the PBX limits the register to some previously configured and

allowed extensions.

Once the PBX has the information of all the telephones in the network, it is already possible to establish a

vocal communication between two

(2)

of them.

Step 2: Call

The user willing to call from one telephone to another dials the extension number and presses the call

button. By doing this, the telephone sends a message to the PBX indicating that it requests to establish a

communication with that extension. In this message, the telephone shows as well which are its technical

characteristics (mainly, the codification types it understands, IP address and listening ports for the audio

packets).

Figure 4. VoIP call

The PBX searches in its list the telephone belonging to that extension and sends it a message inviting to begin

a conversation. This message includes the technical characteristics of the telephone that has initiated the

conversation.

If the telephone receiving the invitation is compatible with the sender characteristics, it accepts the

(2) The current VoIP technology allows establishing calls in multiconference mode, etc which are not considered in this application.

1 2 3 4 5 6 7 8 9 10 11 ... 31 32

Comentarios a estos manuales

Sin comentarios

Equitel E451 Manual de usuario Pagina 6

Comentarios a estos manuales

Relacionado con productos y manuales para Sistemas de intercomunicación de la puerta Equitel E451