Equitel E451 Bedienungsanleitung PDF herunterladen (Seite 7)

October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 4

invitation; the ring tone begins to sound and sends a message to the PBX. This message is resent by the PBX

to the telephone that originated the call which in turn emits the tone.

IP network

IP Telephone

192.168.1.99

Switchboard (PBX)

Ringing... Ringing...

IP Telephone

192.168.1.25

Figure 5. VoIP. Waiting to answer

Step 3: Answer

When receiver picks up the phone, a message indicating that the conversation has been accepted is sent to

the PBX, as well as the necessary data to establish the vocal communication (which codification code is

accepted among the suggested by the emitter; the IP address and the port to which the audio packets must

be sent).

The PBX resends this message to the telephone that began the call.

Figure 6. VoIP. Answer

Step 4: Vocal communication

From this moment on, both telephones begin to exchange the codified audio according the scheme they have

previously agreed.

Figure 7. VoIP. Vocal communication

It is worth to mention that both telephones exchange directly the audio stream, not through the PBX.

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Equitel E451 Bedienungsanleitung Seite 7