Bedienungsanleitung Grandstream GXP21xx series (Seite 45 von 49) (Englisch)

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Grandstream Networks, Inc. GXP21xx User Manual Page 44 of 48

Firmware version: 1.0.1.110 Last Updated: 01/2012

Voice Frames per TX

This field contains the number of voice frames to be transmitted in a single Ethernet

packet (be advised the IS limit is based on the maximum size of Ethernet packet is

1500 byte (or 120kbps)).

When setting this value, be aware of the requested packet time (ptime, used in SDP

message) is a result of configuring this parameter. This parameter is associated

with the first codec in the above codec Preference List or the actual used payload

type negotiated between the 2 conversation parties at run time. E.g., if the first

codec is configured as G.723 and the “Voice Frames per TX” is set to 2, then the

“ptime” value in the SDP message of an INVITE request will be 60ms because each

G.723 voice frame contains 30ms of audio. Similarly, if this field is set to 2 and the

first codec is G.729 or G.711 or G.726, then the “ptime” value in the SDP message

of an INVITE request will be 20ms.

If the configured voice frames per TX exceeds the maximum allowed value, the IP

phone will use and save the maximum allowed value for the corresponding first

codec choice. The maximum value for PCM is 10 (x10ms) frames; for G.726, it is 20

(x10ms) frames; for G.723, it is 32 (x30ms) frames; for G.729/G.728, 64 (x10ms)

and 64 (x2.5ms) frames respectively.

Please be careful when editing these parameters. Adjusting these parameters will

also change the dynamic jitter buffer. The GXP21xx has a patent dynamic jitter

buffer handling algorithm. The jitter buffer range is 20 ~ 200 ms.

We recommend using the default settings provided. We do not recommend

adjusting these parameters if you are an average user. Incorrect settings will affect

the voice quality.

No Key Entry Timeout

Default is 4 seconds. After the timeout, the phone will send out the dialed number.

Use # as Dial Key

This parameter allows users to configure the “#” key as the “Send” (or “Dial”) key. If

set to “Yes”, the “#” key will immediately send the call. In this case, this key is

essentially equivalent to the “(Re)Dial” key. If set to “No”, the “#” key is included as

part of the dial string.

G723 Rate

Encoding rate for G723 codec. By default, 6.3kbps rate is set.

G726-32 Packing Mode

Select “ITU” or “IETF” for G726-32 packing mode.

iLBC Frame Size

iLBC packet frame size. Default is 20ms. For Asterisk PBX, 30ms might be

required.

iLBC Payload Type

Payload type for iLBC. Default value is 97. The valid range is between 96 and 127.

Jitter Buffer Type

Jitter buffer type: Fixed or Adaptive. Default value is Adaptive.

Jitter Buffer Length

Jitter buffer length. Default value is 300ms. The valid range is between 100ms and

800ms.

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