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Grandstream GXP21xx series Manual

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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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