ZyXEL Communications PMG5318-B20B User Manual Download

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Chapter 20 Voice

PMG5318-B20B User’s Guide

103

20.2.1 Dial Plan Rules

A dial plan defines the dialing patterns, such as the length and range of the digits for a telephone
number. It also includes country codes, access codes, area codes, local numbers, long distance
numbers or international call prefixes. For example, the dial plan ([2-9]xxxxxx) does not allow a
local number which begins with 1 or 0.

Without a dial plan, users have to manually enter the whole callee’s number and wait for the
specified dialing interval to time out or press a terminator key (usually the pound key on the phone
keypad) before the GPON Device makes the call.

The GPON Device initializes a call when the dialed number matches any one of the rules in the dial
plan. Dial plan rules follow these conventions:

• The collection of rules is in parentheses ().
• Rules are separated by the | (bar) symbol.
• “x” stands for a wildcard and can be any digit from 0 to 9.
• A subset of keys is in a square bracket []. Ranges are allowed.

For example, [359] means a number matching this rule can be 3, 5 or 9. [26-8*] means a
number matching this rule can be 2, 6, 7, 8 or *.

• The dot “.” appended to a digit allows the digit to be ignored or repeated multiple times. Any digit

(0~9, *, #) after the dot will be ignored.
For example, (01.) means a number matching this rule can be 0, 01, 0111, 01111, and so on.

Preferred codec
1 ~ 6

Select the types of voice coder/decoder (codec) that you want the GPON Device to use
for this SIP account. The GPON Device and the peer must agree on a codec to start a
SIP session.

G.711 is a Pulse Code Modulation (PCM) waveform codec. PCM measures analog signal
amplitudes at regular time intervals and converts them into digital samples. G.711
provides very good sound quality but requires 64 kbps of bandwidth. G.711 is the
default codec used by phone companies and digital handsets.

•

G.711MuLaw

is typically used in North America and Japan.

•

G.711ALaw

is typically used in Europe.

G.723.1

uses Low-Delay Code-Excited Linear Prediction (LD-CELP) to code audio in 30-

millisecond frames. The standard supports two bitrates, 6.3 kbps and 5.3 kbps. G.723.1
provides toll-quality sound and requires very little bandwidth.

G.726

is an Adaptive Differential PCM (ADPCM) waveform codec that uses a lower bit

rate than standard PCM conversion. ADPCM converts analog audio into digital signals
based on the difference between each audio sample and a prediction based on previous
samples. The more similar the audio sample is to the prediction, the less space needed
to describe it. The GPON Device supports it at

kbps.

G.729a

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 8 kbps.

Select

None

have the GPON Device only accept one of the higher-ranked choices.

Apply

Click this to save your changes.

Table 74

SIP Service Provider (continued)

LABEL