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GXV-3000 User Manual Grandstream Networks, Inc.
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Voice Frames
per TX
This field contains the number of voice frames to be transmitted in a single Ethernet
packet (be advised the max. size of Ethernet packet is 1500 byte (or 120k bit) so
user should be aware that there IS a limit there). When setting this value, the user
should be aware of the requested packet time (ptime, used in SDP message) as 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 G723 and the “Voice Frames per TX” is set to
b
e 2, then the “ptime” value in the SDP message of an INVITE request will be 60ms
because each G723 voice frame contains 30ms of audio. Similarly, if this field is set
to be 2 and if the first codec chosen is G729 or G711 or G726, 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 G726, it is 20
(x10ms) frames; for G723, it is 32 (x30ms) frames; for G729/G728, 64 (x10ms) and
64 (x2.5ms) frames respectively.
Please be very careful when massage those parameters. By adjust this, user also get
jitter buffer changed accordingly. BT-100 phone has patent dynamic jitter buffer
handling algorithm. The jitter buffer range from 20 ~ 200 ms.
Incorrect setting will affect voice quality so do not touch the parameter if not
understand and most of the case the default value will work in GS products.
Please refer to the Codec FAQ in our website for more technical details:
http://www.grandstream.com/FAQ-Codec.pdf
Video Frame
Rate
Default value is 15 frames/second. User adjustable based on network condition.
Video bit rate
(kbps)
Default value is 128 kbps. User adjustable based on network environment.
Video fit to
Screen
When the received image size is bigger than the LCD resolution (QVGA), the
GXV3000 can scale the image to fit the LCD or crop it.
Layer 3 QoS
This field defines the layer 3 QoS parameter which can be the value used for IP
Precedence or Diff-Serv or MPLS. Default value is 48.
Layer 2 QoS
This contains the value used for layer 2 VLAN tag. Default setting is
blank.
No Key Entry
Timeout
Default is 4 seconds.
Use # as
Send Key
This parameter allows users to configure the “#” key to be used as the “Send” (or
“Dial”) key. If set to “Yes”, pressing this key will immediately trigger the sending of
dialed string collected so far. In this case, this key is essentially equivalent to the
“(Re)Dial” key. If set to “No”, this “#” key will then be included as part of the dial
string to be sent out.