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Multi-Tech Systems Mvp-2400/2410/3010, Mvp-210/410/810 Voice/ip Gateways S000249C User Guide
Multi-Tech Systems Mvp-2400/2410/3010, Mvp-210/410/810 Voice/ip Gateways S000249C User Guide
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MultiVOIP User Guide Technical Configuration (Digital) 101 The IP Parameters fields are described in the table below. IP Parameter Definitions Field Name Values Description Enable DiffservY/N Diffserv is used for QoS (quality of service). When enabled, we configure the TOS (Type of Service) bits in the IP header so routers supporting Diffserv can give priority to the VOIP’s IP packets. Disabled by default. Frame Type Type II, SNAP Must be set to match network’s frame type. Default is Type II. IP Address 4-places, 0-255The unique LAN IP address assigned to the MultiVOIP. IP Mask 4-places, 0-255 Subnetwork address that allows for sharing of IP addresses within a LAN. Gateway 4-places, 0-255The IP address of the device that connects your MultiVOIP to the Internet. Enable DNS Y/N (feature not yet implemented; for future use)Enables Domain Name Space/System function where computer names are resolved using a worldwide distributed database. DNS Server IP Address4-places, 0-255. (feature not yet implemented; for future use)IP address of specific DNS server to be used to resolve Internet computer names. FTP Server EnableY/N See “FTP Server File Transfers” in Operation & Maintenance chapter.MultiVOIP unit has an FTP Server function so that firmware and other important operating software files can be transferred to the voip via the network.
MultiVOIP User Guide Technical Configuration (Digital Voips) 102 7. Enable Web Browser GUI (Optional). After an IP address for the MultiVOIP unit has been established, you can choose to do any further configuration of the unit (a) by using the MultiVOIP web browser GUI, or (b) by continuing to use the MultiVOIP Windows GUI. If you want to do configuration work using the web browser GUI, you must first enable it. To do so, follow the steps below. A. Set IP address of MultiVOIP unit using the MultiVOIP Configuration program (the Windows GUI). B. Save Setup in Windows GUI. C. Close Windows GUI. D. Install Java program from MultiVOIP product CD (required on first use only). E. Open web browser. F. Browse to IP address of MultiVOIP unit. G. If username and password have been established, enter them when when prompted. H. Use web browser GUI to configure or operate MultiVOIP unit. The configuration screens in the web browser GUI will have the same content as their counterparts in the Windows GUI; only the graphic presentation will be different. For more details on enabling the MultiVOIP web GUI, see the “Web Browser Interface” section of the Operation & Maintenance chapter of this manual.
MultiVOIP User Guide Technical Configuration (Digital) 103 8. Set Voice/FAX Parameters. This dialog box can be reached by pulldown menu, toolbar icon, keyboard shortcut, or sidebar. Accessing “Voice/FAX Parameters” Pulldown Icon Shortcut Sidebar Ctrl + H
MultiVOIP User Guide Technical Configuration (Digital Voips) 104 In each field, enter the values that fit your particular network.
MultiVOIP User Guide Technical Configuration (Digital) 105 Note that Voice/FAX parameters are applied on a channel-by-channel basis. However, once you have established a set of Voice/FAX parameters for a particular channel, you can apply this entire set of Voice/FAX parameters to another channel by using the Copy Channel button and its dialog box. To copy a set of Voice/FAX parameters to all channels, select “Copy to All” and click Copy.
MultiVOIP User Guide Technical Configuration (Digital Voips) 106 The Voice/FAX Parameters fields are described in the tables below. Voice/Fax Parameter Definitions Field Name Values Description Default -- When this button is clicked, all Voice/FAX parameters are set to their default values. Select Channel1-24 (T1) 1-30 (E1)Channel to be configured is selected here. Copy Channel-- Copies the Voice/FAX attributes of one channel to another channel. Attributes can be copied to multiple channels or all channels at once. Voice Gain -- Signal amplification (or attenuation) in dB. Input Gain +31dB to –31dBModifies audio level entering voice channel before it is sent over the network to the remote VOIP. The default & recommended value is 0 dB. Output Gain +31dB to –31dBModifies audio level being output to the device attached to the voice channel. The default and recommended value is 0 dB. DTMF Parameters DTMF Gain -- The DTMF Gain (Dual Tone Multi- Frequency) controls the volume level of the digital tones sent out for Touch- Tone dialing. DTMF Gain, High Tones+3dB to -31dB & “mute”Default value: -4 dB. Not to be changed except under supervision of MultiTech’s Technical Support. DTMF Gain, Low Tones+3dB to -31dB & “mute”Default value: -7 dB. Not to be changed except under supervision of MultiTech’s Technical Support.
MultiVOIP User Guide Technical Configuration (Digital) 107 Voice/Fax Parameter Definitions (cont’d) Field Name Values Description DTMF Parameters Duration (DTMF)60 – 3000 msWhen DTMF: Out of Band is selected, this setting determines how long each DTMF digit ‘sounds’ or is held. Default = 100 ms. DTMF In/Out of BandOut of Band, or InbandWhen DTMF Out of Band is selected (checked), the MultiVOIP detects DTMF tones at its input and regenerates them at its output. When DTMF Inband is selected, the DTMF digits are passed through the MultiVOIP unit as they are received. FAX Parameters Fax Enable Y/N Enables or disables fax capability for a particular channel. Max Baud Rate (Fax, bps)2400, 4800, 7200, 9600, 12000, 14400 Set to match baud rate of fax machine connected to channel (see Fax machine’s user manual). Default = 14400 bps. Fax Volume Default = -9.5 dB-18.5 dB to –3.5 dBControls output level of fax tones. To be changed only under the direction of Multi-Tech’s Technical Support. Jitter Value (Fax)Default = 400 msDefines the inter-arrival packet deviation (in milliseconds) for the fax transmission. A higher value will increase the delay, allowing a higher percentage of packets to be reassembled. A lower value will decrease the delay allowing fewer packets to be reassembled. Mode (Fax) FRF 11; T.38 (T.38 not currently sup- ported)FRF11 is frame-relay FAX standard using these coders: G.711, G.728, G.729, G.723.1. T.38 is an ITU-T standard for storing and forwarding FAXes via email using X.25 packets. It uses T.30 fax standards and includes special provisions to preclude FAX timeouts during IP transmissions.
MultiVOIP User Guide Technical Configuration (Digital Voips) 108 Voice/Fax Parameter Definitions (cont’d) Coder Parameters Coder Manual or Auto- maticDetermines whether selection of coder is manual or automatic. When Automatic is selected, the local and remote voice channels will negotiate the voice coder to be used by selecting the highest bandwidth coder supported by both sides without exceeding the Max Bandwidth setting. G.723, G.729, or G.711 are negotiated. Selected CoderG.711 a/u law 64 kbps; G.726, @ 16/24/32 /40 kbps; G.727, @ nine bps rates; G.723.1 @ 5.3 kbps, 6.3 kbps; G.729, 8kbps; Net Coder @ 6.4, 7.2, 8, 8.8, 9.6 kbpsSelect from a range of coders with specific bandwidths. The higher the bps rate, the more bandwidth is used. The channel that you are calling must have the same voice coder selected. Default = G.723.1 @ 6.3 kbps, as required for H.323. Here 64K of digital voice is compressed to 6.3K, allowing several simultaneous conversations over the same bandwidth that would otherwise carry only one. To make selections from the Selected Coder drop-down list, the Manual option must be enabled. Max bandwidth (coder)11 – 128 kbpsThis drop-down list enables you to select the maximum bandwidth allowed for this channel. The Max Bandwidth drop-down list is enabled only if the Coder is set to Automatic. If coder selected automatically, then enter a value for maximum bandwidth, as directed by VOIP administrator.
MultiVOIP User Guide Technical Configuration (Digital) 109 Voice/Fax Parameter Definitions (cont’d) Field Name Values Description Advanced Features Silence Compression Y/NDetermines whether silence compression is enabled (checked) for this voice channel. With Silence Compression enabled, the MultiVOIP will not transmit voice packets when silence is detected, thereby reducing the amount of network bandwidth that is being used by the voice channel. Default = off. Echo CancellationY/NDetermines whether echo cancellation is enabled (checked) for this voice channel. Echo Cancellation removes echo and improves sound quality. Default = on. Forward Error CorrectionY/NDetermines whether forward error correction is enabled (checked) for this voice channel. Forward Error Correction enables some of the voice packets that were corrupted or lost to be recovered. FEC adds an additional 50% overhead to the total network bandwidth consumed by the voice channel. Default = Off Auto Call EnableY/NThe Auto Call option enables the local MultiVOIP to call a remote MultiVOIP without the user having to dial a Phone Directory Database number. As soon as you access the local MultiVOIP voice/fax channel, the MultiVOIP immediately connects to the remote MultiVOIP identified in the Phone Number box of this option. Phone No. (Auto Call)--Phone number used for Auto Call function. A corresponding phone number must be listed in the Outbound Phonebook.
MultiVOIP User Guide Technical Configuration (Digital Voips) 110 Voice/Fax Parameter Definitions (cont’d) Field Name Values Description Dynamic Jitter Dynamic Jitter BufferDynamic Jitter defines a minimum and a maximum jitter value for voice communications. When receiving voice packets from a remote MultiVOIP, varying delays between packets may occur due to network traffic problems. This is called Jitter. To compensate, the MultiVOIP uses a Dynamic Jitter Buffer. The Jitter Buffer enables the MultiVOIP to wait for delayed voice packets by automatically adjusting the length of the Jitter Buffer between configurable minimum and maximum values. An Optimization Factor adjustment controls how quickly the length of the Jitter Buffer is increased when jitter increases on the network. The length of the jitter buffer directly effects the voice delay between MultiVOIP gateways. The default minimum dynamic jitter buffer of 60 milliseconds is the minimum delay that would be acceptable over a low jitter network. The default maximum dynamic jitter buffer of 300 milliseconds is the maximum delay tolerable over a high jitter network. Minimum Jitter Value60 to 400 msThe default minimum dynamic jitter buffer of 60 milliseconds is the minimum delay that would be acce ptable over a low jitter network. Default = 60 msec