Grandstream Networks GXP1625 Administration Guide

GXP16XX Administration Guide
Version 1.0.4.100
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NAT Traversal
This parameter configures whether the NAT traversal mechanism is activated.
Users could select the mechanism from No, STUN, Keep-Alive, UPnP, Auto or
VPN. If set to “STUN” and STUN server is configured, the phone will route
according to the STUN server. If NAT type is Full Cone, Restricted Cone or Port-
Restricted Cone, the phone will try to use public IP addresses and port number
in all the SIP&SDP messages. The phone will send empty SDP packet to the
SIP server periodically to keep the NAT port open if it is configured to be “Keep-
Alive”. Configure this to be “No” if an outbound proxy is used. “STUN” cannot be
used if the detected NAT is symmetric NAT.
Proxy-Require
A SIP Extension to notify the SIP server that the phone is behind a NAT/Firewall.
Do not configure this parameter unless this feature is supported on the SIP
server.
Use SBC
Indicate whether or not a SBC server is used.
Account x  SIP Settings  Basic Settings
TEL URI
If the phone has an assigned PSTN telephone number, this field should be set
to “User=Phone”. Then a “User=Phone” parameter will be attached to the
Request-Line and “TO” header in the SIP request to indicate the E.164 number.
If set to “Enable”, “Tel:” will be used instead of “SIP:” in the SIP request. The
default setting is “Disable”.
SIP Registration
Selects whether the phone will send SIP Register messages to the proxy/server.
The default setting is “Yes”.
Unregister On Reboot
Allows the SIP user's registration information to be cleared when the phone
reboots. The SIP REGISTER message will contain “Expires: 0” to unbind the
connection. Three options are available:
• If set to "All", the SIP user's registration information will be cleared when the
phone reboots. The SIP Contact header will contain "*" to notify the server
to unbind the connection.
• If set to "Instance", the SIP user will be unregistered on current phone only.
• If set to “No”, the phone will not unregister the SIP account when rebooting.
The default setting is "No".
Register Expiration
Specifies the frequency (in minutes) in which the phone refreshes its registration
with the specified registrar. The default value is 60 minutes. The maximum value
is 64800 minutes (about 45 days).
Subscribe Expiration
Specifies the frequency (in minutes) in which the phone refreshes its
subscription with the specified registrar. The default is 60, and maximum value
is 64800 (about 45 days).
Reregister Before
Expiration
Specifies the time frequency (in seconds) that the phone sends re-registration
request before the Register Expiration. The default value is 0.
Enable OPTIONS
Keep Alive
Select whether or not the phone will keep sending a message to check the
connection with the server.

Grandstream Networks GXP1625 Specifications

General

Brand	Grandstream Networks
Model	GXP1625
Category	IP Phone
Language	English