User guide

VOIP INFORMATION 247
3. Select the codecs your system can use, and clear the unsupported codecs. The following
codecs are supported:
• G.729 — This codec provides good quality. It requires the least bandwidth and
accommodates the highest number of concurrent calls.
• G.726 — This codec provides better quality. It requires more bandwidth and
accommodates fewer concurrent calls.
• G.711µ and G.711A — This codec provides high quality and supports Fax over IP. It
requires the most bandwidth and accommodates the fewest number of concurrent calls.
G.711µ is used in North America and Japan. G.711A is used elsewhere.
4. Select the Preferred codec. G.729 is the default codec.
5. Set Voice activity detection (VAD). Enabling VAD reduces voice bandwidth when no speech is
detected, and reduces transmission of background noise. We recommend disabling VAD to
keep bandwidth available for speech.
CONFIGURING VOIP NUMBERS FOR A SERVICE PROVIDER VOIP NETWORK
If you are using a TalkSwitch-certified VoIP service provider, visit the support section at http://
global.talkswitch.com to access the service configuration guide for your VoIP service provider.
Otherwise use the procedures in this section.
A VoIP number is like a telephone number, and is used to dial a TalkSwitch system at a particular
location. Your service provider will assign VoIP numbers for each location.
1. Select the VoIP Numbers page.
2. Select a VoIP number slot.
3. Select the Activate VoIP Number check box.
4. Set the VoIP profile to the service provider (e.g. My Service Provider).
5. Enter the Country Code (if required), the City or Area Code and the Number.