Grandstream Networks GXP2000EXT Manual page 32

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Voice Frames per TX
Layer 3 QoS
Layer 2 QoS
Data VLAN Tag
No Key Entry Timeout
Use # as
Dial Key
Local RTP port
Use Random Port
Grandstream Networks, Inc.
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 GXP has a patent dynamic jitter
buffer handling algorithm. The jitter buffer range is 20 ~ 200 ms.
Grandstream recommends using the default settings provided. Grandstream
does not recommend adjusting these parameters if you are an average user.
Incorrect settings will affect the voice quality. Please refer to the Codec FAQ
at http://www.grandstream.com/pdf/FAQ-Codec.pdf
This field defines the layer 3 QoS parameter.
Precedence or Diff-Serv or MPLS. Default value is 48.
This contains the value used for layer 2 VLAN tag. Default setting is blank.
Default is 0. Enabling the Data VLAN filtering will help reduce the load on the
phone, but it isn't necessary in most environments. This is primarily for VLAN
filtering where tagged traffic will be forwarded to the DSP.
Default is 4 seconds.
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.
This parameter defines the starting local RTP-RTCP port pair used to listen and
transmit. It is the base RTP port for channel 0. When configured, channel 0 will
use this port _value for RTP and the port_value+1 for its RTCP; channel 1 will
use port_value+2 for RTP and port_value+3 for its RTCP. The default value is
5004.
This parameter, when set to "Yes", will force random generation of both the local
SIP and RTP ports. This is usually necessary when multiple GXPs are behind
the same NAT. Default is No.
GXP User Manual
Firmware 1.2.5.3
for more technical detail.
It is the value used for IP
Page 32 of 44
Last Updated: 03/2011