D-Link DVG-3016S User Manual download pdf (Page 33)

DVG-3016S/3032S User’s Manual Advanced Options

D-Link Systems, Inc. 30

Codec Settings

y Preferred Codec Type: Since different voice codecs have different compression ratios, the sound

quality and occupied bandwidths are also different. It is recommended that you use the default

provided (G.723.1) because it occupies less bandwidth and will provide better sound quality.

y Jitter Buffer: Adjusts the jitter to receive a packet. If the jitter range is too wide, it will delay voice

transmission.

y Silence Suppression: If one side of a connection is not speaking, the system will stop sending voice

data (package) to decrease bandwidth usage.

y Echo Canceling: Prevents poor telecommunication quality caused by echo interference.

y Codec: Choose the codec that you needs.

y Packet Time: Defines how long the gateway sends a RTP packet or voice packet to the receiving side.

The smaller the value, the greater the bandwidth usage, but larger values increase voice delay.

y Approximate Bandwidth Require: The bandwidth required varies with codec format and packet time.

Fax Settings

NOTE: When a fax tone is detected in a call, the gateway will automatically switch from voice mode to

fax mode. So fax settings will be temporarily applied to a specific port which detects fax tones, instead

of its default voice settings.

y Enable High Quality: The system sends the same fax frame twice to get a high quality fax

transmission. Enabling this variable increases bandwidth requirements.

y T.30: The system uses T.30 as the protocol for fax transmission. The parameter settings are the same

as for voice transmission. However, enabling the T.30 protocol will consume more network resources

and will affect transmission quality.

NOTE: When you send fax over an IP network it needs your network to support fax over IP

functionality (either T.38 or T.30). Please consult your VoIP service provider for this setting.

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D-Link DVG-3016S User Manual Page 33