Grandstream Networks GXP-2000 User Manual

Page 33

GXP-2000 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 packet. When setting this value, the user should be aware of the
requested packet time (used in SDP message) as a result of
configuring this parameter. This parameter is associated with the first
vocoder in the above vocoder Preference List or the actual used
payload type negotiated between the 2 conversation parties at run
time.
e.g., if the first vocoder is configured as G723 and the “Voice Frames
per TX” is set to be 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 vocoder 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 GXP-2000 will use and save the maximum allowed value
for the corresponding first vocoder 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.

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.

Use DNS SRV:

Default is No. If set to Yes the client will use DNS SRV for server
lookup

User ID is Phone
Number

If the GXP-2000 has an assigned PSTN telephone number, this field
should be set to “Yes”. Otherwise, set it to “No”. If “Yes” is set, a
“user=phone” parameter will be attached to the “From” header in SIP
request

SIP Registration This parameter controls whether the GXP-2000 needs to send

Unregister on
Reboot

Default is No. If set to yes, the SIP user will be unregistered on
reboot.