Grandstream Networks GXP2120 User Manual User Manual page 53

Use Random Port
Keep-alive Interval
Use NAT IP
STUN Server
Public Mode
Settings -> Call Features
Off-hook Auto Dial
Off-hook Timeout
Intercom User ID
Disable Call Waiting
Disable Call Waiting Tone
Disable Direct IP Call
Use Quick IP Call mode
FIRMWARE VERSION 1.0.5.24
When set to "Yes", this parameter will force random generation of both
the local SIP and RTP ports. This is usually necessary when multiple
phones are behind the same full cone NAT. The default setting is "Yes"
(This parameter must be set to "No" for Direct IP Calling to work).
Specifies how often the phone sends a blank UDP packet to the SIP
server in order to keep the "ping hole" on the NAT router to open. The
default setting is 20 seconds.
The NAT IP address used in SIP/SDP messages. This field is blank at
the default settings. It should ONLY be used if it's required by your ITSP.
The IP address or Domain name of the STUN server. STUN resolution
results are displayed in the STATUS page of the Web GUI. Only
non-symmetric NAT routers work with STUN.
Configures to turn on/off public mode for hot desking feature on the
phone. If set to "Yes", users would need fill in the SIP Server address for
account 1 as well. Then reboot the phone. When the phone boots up,
users will need enter SIP User ID and Password on the LCD to login and
use the phone.
Note:
When the phone is in public mode login screen, press CONF button will
have the IP address of the phone displayed.
Configures a User ID/extension to dial automatically when the phone is
off hook. The phone will use the first account to dial out. The default
setting is "No".
If configured, when the phone is on hook, it will go off hook after the
timeout (in seconds). The default value is 30 seconds.
Configures the intercom extension number for account 1 to dial out (Not
applicable to GXP14xx). This User ID is mapped to the INTERCOM
button on the phone.
Disables the call waiting feature. The default setting is "No".
Disables the call waiting tone when call waiting is on. The default setting
is "No".
Disables Direct IP Call. The default setting is "No".
When set to "Yes", users can dial an IP address under the same
LAN/VPN segment by entering the last octet in the IP address. To dial
quick IP call, off hook the phone and dial #XXX (X is 0-9 and XXX
GXP2120/GXP2110/GXP2100/GXP14xx USER MANUAL Page 53 of 77