user manual
GXV-3000 User Manual  Grandstream Networks, Inc. 
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Local RTP 
port 
This parameter defines the local RTP-RTCP port pair the GXV-3000 will 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. 
Use Random 
Port 
This parameter, when set to Yes, will force random generation of both the local SIP 
and RTP ports. This is usually necessary when multiple GXV-3000s are behind the 
same NAT. 
Keep-alive 
interval 
This parameter specifies how often the GXV-3000 sends a blank UDP packet to the 
SIP server in order to keep the “hole” on the NAT open. Default is 20 seconds. 
Use NAT IP 
NAT IP address used in SIP/SDP message. Default is blank. 
STUN Server 
IP address or Domain name of the STUN server. 
Firmware 
Upgrade and 
provisioning 
This radio button will enable GXV-3000 to download firmware or configuration file 
through either HTTP or local TFTP server. This is mutual exclusive choice. 
Via TFTP 
Server 
This is the IP address of the configured TFTP server. If selected and it is non-zero or 
not blank, the GXV-3000 will attempt to retrieve new configuration file or new code 
image from the specified TFTP server at boot time. It will make up to 3 attempts 
b
efore timeout and then it will start the boot process using the existing code image in 
the Flash memory. If a TFTP server is configured and a new code image is retrieved, 
the new downloaded image will be verified and then saved into the Flash memory. 
Note: It is strongly recommended that user upgrade firmware locally in LAN 
environment if using TFTP to upgrade. Please do NOT interrupt the TFTP upgrade 
process (especially the power supply) as this will damage the device. 
Via HTTP 
Server 
The URL for the HTTP server used for firmware upgrade and configuration via 
HTTP. For example, 
http://provisioning.mycompany.com:6688/Grandstream/1.0.0.14 
Here “:6688” is the specific TCP port that the HTTP server is listening at, it can be 
omitted if using default port 80. 
Note: If Auto Upgrade is set to No, GXV-3000 will only do HTTP download once 
at boot up. 
Automatic 
Upgrade 
Default is Yes. Choose Yes to enable automatic HTTP upgrade and provisioning. 
In “Check for upgrade every” field, enter the number of minutes to enable the phone 
to check the HTTP server for firmware upgrade or configuration changes in the 
defined period of time. 
When set to No, the phone will only do HTTP upgrade and configuration check once 
at boot up. Used by ITSP. End user should NOT touch these parameters. 
DTMF 
Payload Type 
This parameter sets the payload type for DTMF using RFC2833. 










