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| Chapter 4: Configuring your VOIP | |
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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. |
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| Automatic | When Automatic is selected, the local and remote voice channels |
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| will negotiate the voice coder to be used by selecting the highest |
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| bandwidth coder supported by both sides without exceeding the |
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| Max Bandwidth 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 |
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| (SS models only) | G.726, @ 16/24/32/40 kbps; | higher the bps rate, the more bandwidth is used. The channel |
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| G.727, @ nine bps rates; | that you are calling 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 |
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| G.729, 8kbps; | of digital voice is compressed to 6.3K, allowing several |
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| Net Coder @ | simultaneous conversations over the same bandwidth that would |
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| 6.4, 7.2, 8, 8.8, 9.6 kbps | otherwise carry only one. |
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| To make selections from the Selected Coder |
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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 |
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| the Selected Coder listing of the Coder group on the Voice/Fax |
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| G.729, G.711 | screen. If G.711 is the higher priority, i.e., G.711 is preferred to |
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| G729 on the sending side, then G.711, G.729 option is selected. |
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| Similarly, if G.729 has the higher priority, then G.729, G.711 |
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| option is selected. |
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| It is used whenever a user wants to advertise both G.711 and |
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| G.729 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 |
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| the VOIP to two different destinations where one supports G.711 |
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| and the other supports G.729. |
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| Max bandwidth |
| 11 – 128 kbps | This |
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| (coder) |
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| bandwidth allowed for this channel. The Max Bandwidth drop- |
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| down list is enabled only if the Coder is set to Automatic. |
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| If coder is to be selected automatically (“Auto” setting), then enter |
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| a value for maximum bandwidth. |
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| Advanced Features |
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| Silence |
| Y/N | Determines whether silence compression is enabled (checked) |
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| Compression |
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| for this voice channel. |
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| With Silence Compression enabled, the MultiVOIP will not |
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| transmit voice packets when silence is detected, thereby |
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| reducing the amount of network bandwidth that is being used by |
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| the voice channel (default = on). |
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| Echo |
| Y/N | Determines whether echo cancellation is enabled (checked) for | |
| Cancellation |
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| this voice channel. |
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| Echo Cancellation removes echo and improves sound quality |
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| (default = on). |
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| Forward Error |
| Y/N | Determines whether forward error correction is enabled | |
| Correction |
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| (checked) for this voice channel. |
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| Forward Error Correction enables some of the voice packets |
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| that were corrupted or lost to be recovered. FEC adds an |
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| additional 50% overhead to the total network bandwidth |
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| consumed by the voice channel (default = Off). |
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| Table is continued on | next page… |
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37 |
