Allied Telesis AT-iMG634 - R2 User's Guide download pdf (Page 624)

100

101

VoIP phone ports Port configuration

iMG/RG Software Reference Manual (Voice Service)

6-60

The analogue endpoint module (AEP) is the module in charge to control analogue ports. This module detects

hardware events like off-hook and DTMF key press and controls hardware functions such as tone generation

and ringing.

The analogue endpoint module also performs the voiceband processing required to interface analog or PCM

voice, fax with data networks incorporating packet-based protocols such as Internet protocol (IP).

This system incorporates a voiceband processor (VoIP DSP) that operates in conjunction with analogue inter-

face circuitry and with the unit main processor (CPU).

The unit main processor implements packet network protocol stacks and system control, while the voice-band

processor primarily performs mathematically intensive DSP algorithms.

The following are the features available on the Voice system:

Voice encoding/decoding

• G.711 A-/µ-law 64 Kbps PCM Speech CODEC

• G.729A/B CS-ACELP Speech CODEC with VAD

• G.726-32Kbps

• T.38 support for transmission of T.30 fax signals into T.30 Internet Fax Protocol (IFP) packets.

Voice quality management

• Fixed Gain Control configurable independently on TX and RX transmission

• G.168 Line Echo Cancellation management (disabled or 16 ms – on analogue ports only)

• Voice Activity Detection (VAD)

• Comfort Noise Generation (CNG)

Telecom tone management

• To n e G e n e r a t i o n

• DTMF Detection

6.3.1 Port configuration

Port creation and configuration (if necessary) are part of the VoIP system configuration steps required in order

to receive or make calls, as illustrated in Figure 6-4.

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