Grandstream Networks, Inc.
GXV300x User Manual
Page 27 of 54
Firmware 1.2.3.7
Updated: 12/2010
T
ABLE
12:
A
DVANCED
S
ETTINGS
C
ONFIGURATION
P
AGE
D
EFINITIONS
Admin Password
Administrator password. Only the administrator can configure the “Advanced Settings” page and
“Account x” pages. Password field is purposely blank for security reasons after clicking update and
saved. The maximum password length is 25 characters.
G723 rate
G.723 audio codec encoding rate, either 6.3kbps or 5.3kbps, check with ITSP or Server/Proxy.
Silence
Suppression
This controls the silence suppression/VAD feature of the audio codec G.723 and G.729.
If set to “Yes”, when silence is detected, a small quantity of VAD packets (instead of audio pack-
ets) will be sent during the period of no talking.
If set to “No”, this feature is disabled.
Voice Frames
per TX
This field contains the number of voice frames to be transmitted in a single Ethernet packet (be
advised the limit is based on the maximum size of Ethernet packet which is 1500 byte or 12kbps).
When setting this value, be aware 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 par-
ties 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 val-
ue 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
jitter buffer. The GXV300x has a patent jitter buffer handling algorithm.
Grandstream recommends using the default settings and not adjusting these parameters.
Incorrect settings will affect the voice quality.
Video Frame Rate Default value is 15 frames/second. The video frame rate is adjustable based on network condi-
tions. Increasing the frame rate will increase the amount of data significantly therefore con-
suming more bandwidth. Lack of bandwidth the video will get impaired due to packet loss.
Video bit rate
(kbps)
Default value is 128 kbps. The video bit rate is adjustable based on network environment.
Increasing video bit rate may improve video quality if bandwidth allows.
Otherwise the video quality will get impaired due to packet loss.
Video downloading bit rate can also be adjusted after video conversation is established.
- Use MWI button
to toggle between VOLUME, BIT RATE, and Tone Remapping Filter
mode.
- After choosing the feature, use UP and DOWN arrow button to adjust. By pressing the UP and
DOWN button, GXV300X sends out SIP INFO to tell remote party increase/decrease its uploading
rate.
Video Packet Size Default value is 1400, range from 100 to 1400.
Recommended using 600~800 if you have Outbound Proxy or Media Gateway.
Video Rate
Control
Frame or TMN8. Default is Frame.
TMN8 is good for bandwidth bigger than 384kbps
