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| H.263+ Payload type |
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| Selects the H.263+ codec payload type (ranges from |
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| setting is 103. |
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| Selects the |
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| setting is 103. |
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| H.263 Encoder Resolution |
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| Selects the resolution (CIF/QCIF) used for H.263 codec. The default |
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| resolution is CIF. |
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| Silence Suppression |
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| This controls the G723/G729 silence suppression/VAD. If set to YES, when |
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| no audio is detected, the phone will send a small number of VAD packets |
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| (instead of audio packets). If Set to NO, this feature is disabled. The default |
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| setting is NO. |
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| Voice Frame per TX |
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| This configures the number of voice frames transmitted per packet. (It is |
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| recommended to set this based on the Ethernet IS packet limitation – 1500 |
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| Byte or 120kb/s). |
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| When configuring this, it should be noted that the “ptime” value for the SDP |
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| will change with different configurations here. This value is related to the |
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| codec used and the actual frames transmitted during the in payload call. |
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| For example: if the codec is configured to be G.723 and “Voice Frames per |
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| TX” is set to 2. Then in the INVITE request, the “ptime” value for SDP will be |
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| 60 ms. This is because the G723 voice frame is 30 ms. Similarly, if the |
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| setting is 2 and the codec is G729 or G711 or G726, the “ptime” value for |
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| SDP in the INVITE request will be 20 ms. |
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| If the voice frames per TX configuration exceeds the maximum value |
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| allowed, the phone will choose the preferred codec and use the maximum |
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| value allowed. |
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| The maximum value is 64 frames. |
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| Adjusting these values will also change the jitter buffer. The phone has an |
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| algorithm for setting the jitter buffer and the jitter | buffer rate is around |
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| For |
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| settings may influence the quality of audio. |
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| G723 Rate |
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| This defines the encoding rate for G723 vocoder, and can be 6.3Kb/s or |
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| 5.3Kb/s. Please confirm with your service provider. |
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| Jitter Buffer Type |
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| Users can select either Fixed or Adaptive based on network conditions. The |
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| default is Adaptive. |
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| Jitter Buffer Length |
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| User can select Low, Medium, or High based on network conditions. The |
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| default is Medium. |
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| Grandstream Networks, Inc. | GXV3175 USER MANUAL | Page 52 of 119 |
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| FIRMWARE VERSION 1.0.0.32 | Updated : 12/2010 |
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