D-Link DVG-6008S user manual Codec, Fax Settings

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Codec

Preferred Codec Type: Since different voice codec have different compression ratios, so the sound quality and occupied bandwidths are also different. It is recommended to use the default provided (G.723.1) because it occupies less bandwidth and will provide better sound quality.

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

Silence Suppression: If one side of a connection is not speaking, the system will stop sending voice data (package) to decrease bandwidth usage.

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

Codec: Choose the codec that you needs.

Packet Time: Defines how long the gateway sends a RTP packet-voice packet- to the other side. The smaller the value, the more bandwidth usage. The larger the value, the more voice delay.

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

Fax Settings

T.38: The T.38 protocol is used for better and faster facsimile transmission. When this function is enabled, the following fax and voice parameter settings will be disabled, so it is recommended to enable this function to gain better fax quality. When this function is enabled, please select UDP, TCP, or AUTO. If selecting TCP and some routers cannot use the Fax function, please select UDP instead.

Enable High Quality: The system sends the same FAX frame twice to get a high quality of the FAX. It requires more bandwidth.

Enable Secure T.38: This allows gateways to send faxes on both sides.

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Contents DVG-6008S Voip Gateway Page Contents IP Sharing Functions Coding Principle Advanced FeatureProduct Overview IntroductionHardware Description Front Panel DVG-6008S Model Rear PanelNetwork Interface Gateway Assigned with a Public IP AddressGateway in a NAT network Page Integrating Line Ports with PBX Telephone Interface DescriptionBasic Settings of a Gateway PreparationIVR Interactive Voice Response To inquire about current Gateway’s WAN Port IP address Save SettingsSoftware Upgrades InstructionsIVR Functions Table Function Code Description Example Function Code Description Example Default Gateway Settings Static IP Settings Function Command Select a Static IPIP address Settings Subnet Mask SettingsSelect a PPPoE Adsl PPPoE SettingsPPPoE Account Settings Recorded Voice FilePPPoE Character Conversion Table Instructions Network Settings WANPage Adsl PPPoE Settings IP Configuration Setting WAN PortSetting Dynamic IP Dhcp Setting Static IPDNS Settings BigPond for Australia use onlyClone MAC Using Phone Books Manager Network Settings LAN LAN interface mode※LAN IP/Subnet mask Dhcp Settings QoS Settings WAN QoSLAN QoS※ NAT Traversal NAT/DDNSDdns For example Telephony SettingsPrefix Number Rules ExampleHotline Functions Example Description SIP 164 System Each line registers to Proxy independently FXO Representative number registers to ProxyCalling Features Advanced Options Line Settings Codec Fax SettingsPage Digit Map Speed Dial Phone BookCDR Settings Caller FilterACL for Management Transit Call Control LanguageLong Distance Exception Table Long-Distance Control TableCPT parameters Table CPT/Cadence SettingsBusy Tone Cadence Measurement UDT DetectionDetailed description is given below Direct Connection to Pstn Connected to a PBX Extension Line Page Filling in the CPT Table Save SettingsSystem Information RTP Packet Summary Stun InquiryPing Test Snmp Backup/RestoreSystem Operations Save Settings Provision SettingsLogout Software UpgradeIP Sharing Functions Select TCP/IP, and then click Properties Page Dialed Number Processing Flow InstructionEnd RIPRouting Information Protocol ※ Static Route※IP Filtering Port filteringVirtual Server MAC FilteringSpecial Applications※ URL Filter※DoS Prevention Settings※