Specifications

Telephony Advanced Setting

Configure the Telephony advanced settings on this page, and click ‘OK.’

SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs).

A user agent can function in one of the following roles:

1. User agent client (UAC) - A client application that initiates the SIP request.

2. User agent server (UAS) - A server application that contacts the user when a SIP

request is received and that returns a response on

behalf of the user.

Typically, an SIP end point is capable of functioning as both a UAC and a UAS, but

functions only as one or the other per transaction.

Phone standards vary internationally, so it is important that the ADSL Modem

Multiservices PSTN Voice is configured for the correct country.

Codecs are used to convert an analog voice signal to digitally encoded version.

Codecs vary in the sound quality, the bandwidth required, the computational

requirements, etc. You can specify which audio coding process you would like to use.

There are four voice codecs supported by the ADSL Modem Multiservices PSTN

Voice, you may try different settings to determine the best audio quality you obtain

from the combination of your network connection and your used audio device (head

set or hand set). The default codec sequence is listed below. You can use the Up and

Down buttons to change priority.

1. G.711 A law

2. G.711 U law

3. G.729

4. G.723.3