Grandstream GXV3140 User Manual Bedienungsanleitung PDF herunterladen (Seite 52)

FIRMWARE VERSION 1.0.7.80 GXV3140 USER MANUAL Page 52 of 151

Voice Frame per TX

This configures the number of voice frames transmitted per packet. (It is

recommended to set this based on the Ethernet IS packet limitation – 1500

Byte or 120kb/s).

When configuring this, it should be noted that the “ptime” value for the SDP

will change with different configurations here. This value is related to the

codec used and the actual frames transmitted during the in payload call.

For example: if the codec is configured to be G.723 and “Voice Frames per

TX” is set to 2. Then in the INVITE request, the “ptime” value for SDP will

be 60 ms. This is because the G723 voice frame is 30 ms. Similarly, if the

setting is 2 and the codec is G729 or G711 or G726, the “ptime” value for

SDP in the INVITE request will be 20 ms.

If the voice frames per TX configuration exceeds the maximum value

allowed, the phone will choose the preferred codec and use the maximum

value allowed.

The maximum value is 64 frames.

Adjusting these values will also change the jitter buffer. The phone has an

algorithm for setting the jitter buffer and the jitter buffer rate is around

20-200ms.

For end-users, it is recommended to use the default setting, as incorrect

settings may influence the quality of audio.

G723 Rate

This defines the encoding rate for G723 vocoder, and can be 6.3Kb/s or

5.3Kb/s. Please confirm with your service provider.

Jitter Buffer Type

Users can select either Fixed or Adaptive based on network conditions. The

default is Adaptive.

Jitter Buffer Length

User can select Low, Medium, or High based on network conditions. The

default is Medium.

Account/Call Settings

Start Video Automatically

Default is Yes.

Remote Video Request

This field sets the preference of video request handling during an audio call

– prompt the user, accept automatically or deny automatically.

Dial Plan Prefix

Sets the prefix added to each dialed number.

Dial Plan

Dial Plan Rules:

1. Accepted Digits: 1,2,3,4,5,6,7,8,9,0 , *, #, A,a,B,b,C,c,D,d,+

2. Grammar: x - any digit from 0-9;

a) xx+ - at least 2 digit numbers

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