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| Chapter 4 – Configuring Your MultiVOIP |
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| Voice/Fax Parameter Definitions (continued) | |
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| Coder Parameters |
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| Coder |
| Manual or | Determines whether selection of coder is manual or automatic. When |
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| Automatic | Automatic is selected, the local and remote voice channels negotiate |
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| the voice coder to be used by selecting the highest bandwidth coder |
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| supported by both sides without exceeding the Max Bandwidth |
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| setting. G.723, G.729, or G.711 are negotiated. |
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| Selected Coder |
| G.711 a/u law 64 kbps; | Select from a range of coders with specific bandwidths. The higher the |
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| G.726, @ 16/24/32/40 kbps; | bps rate, the more bandwidth is used. The channel that you are calling |
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| G.727, @ nine bps rates; | must have the same voice coder selected. |
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| G.723.1 @ 5.3 kbps, 6.3 kbps; | Default = G.723.1 @ 6.3 kbps, as required for H.323. Here 64K of digital |
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| G.729, 8kbps; | voice is compressed to 6.3K, allowing several simultaneous |
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| Net Coder @ | conversations over the same bandwidth that would otherwise carry |
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| 6.4, 7.2, 8, 8.8, 9.6 kbps | only one. |
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| To make selections from the Selected Coder drop‐down list, the |
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| Manual option must be enabled. |
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| Selected Coder |
| G.711, G.729 | Coder Priority has two options (G.711,G.729 or G.729, G711) on the |
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| ‐or‐ | Selected Coder listing of the Coder group on the Voice/Fax window. If |
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| G.729, G.711 | G.711 is the higher priority, that is, G.711 is preferred to G729 on the |
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| sending side, then G.711, G.729 option is selected. Similarly, if G.729 |
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| has the higher priority, then G.729, G.711 option is selected. |
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| It is used whenever a user wants to advertise both G.711 and G.729 |
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| coders with higher preference to a particular coder. |
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| It is useful when the calls are made from a particular channel on the |
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| VOIP to two different destinations where one supports G.711 and the |
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| other supports G.729. |
| Max bandwidth |
| 11 – 128 kbps | This drop‐down list enables you to select the maximum bandwidth |
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| allowed for this channel. The Max Bandwidth drop‐down list is enabled |
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| only if the Coder is set to Automatic. |
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| If coder is to be selected automatically (“Auto” setting), then enter a |
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| value for maximum bandwidth. |
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| Advanced Features |
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| Silence |
| Y/N | Determines whether silence compression is enabled (checked) for this |
| Compression |
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| voice channel. |
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| With Silence Compression enabled, the MultiVOIP does not transmit |
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| voice packets when silence is detected, thereby reducing the amount |
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| of network bandwidth that is being used by the voice channel (default |
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| = on). |
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| Echo Cancellation |
| Y/N | Determines whether echo cancellation is enabled (checked) for this |
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| voice channel. |
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| Echo Cancellation removes echo and improves sound quality (default = |
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| on). |
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| Forward Error |
| Y/N | Determines whether forward error correction is enabled (checked) for |
| Correction |
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| this voice channel. |
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| Forward Error Correction enables some of the voice packets that were |
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| corrupted or lost to be recovered. FEC adds an additional 50% |
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| overhead to the total network bandwidth consumed by the voice |
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| channel (default = Off). |
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| Table is continued on next | page… |
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MultiVOIP® Voice/Fax over IP Gateways | 41 |
