G.711; G.729; Pstn Call Setup Signaling; Mwi (Message Waiting Indication) - ZyXEL Communications Prestige P-2002 Series User Manual

5.6.1 G.711

G.711 is a Pulse Code Modulation (PCM) waveform codec. G.711 provides very good sound
quality but requires 64kbps of bandwidth.

5.6.2 G.729

G.729 is an Analysis-by-Synthesis (AbS) hybrid waveform codec that uses a filter based on
information about how the human vocal tract produces sounds. G.729 provides good sound
quality and reduces the required bandwidth to 8kbps.

5.7 PSTN Call Setup Signaling

Dual-Tone MultiFrequency (DTMF) signaling uses pairs of frequencies (one lower frequency
and one higher frequency) to set up calls. It is also known as Touch Tone®. Each of the keys
on a DTMF telephone corresponds to a different pair of frequencies.
Pulse dialing sends a series of clicks to the local phone office in order to dial numbers.

5.8 MWI (Message Waiting Indication)

Enable Message Waiting Indication (MWI) enables your phone to give you a message–
waiting (beeping) dial tone when you have a voice message(s). Your voice service provider
must have a messaging system that sends message waiting status SIP packets as defined in
RFC 3842.
1. The Prestige does not support pulse dialing at the time of writing.
Chapter 5 Introduction to VoIP
P-2002 Series User's Guide
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