User's Manual

FIRMWARE VERSION 1.0.0.3 GXP2140 USER MANUAL Page 41 of 77

Asterisk server, 8500 could be used.

Account x -> Network Settings

DNS Mode

This parameter controls how the Search Appliance looks up IP addresses for

hostnames. There are four modes: A Record, SRV, NATPTR/SRV, Use

Configured IP. The default setting is "A Record". If the user wishes to locate

the server by DNS SRV, the user may select "SRV" or "NATPTR/SRV". If "Use

Configured IP" is selected, please fill in the three fields below:

 Primary IP: The primary IP address where the phone sends DNS query

to;

 Backup IP 1;

 Backup IP 2.

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.

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 or not the phone will send SIP Register messages to the

proxy/server. The default setting is "Yes".

Unregister On Reboot

If set to "Yes", 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. The default setting is "No".

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).

Reregister Before

Specifies the time frequency (in seconds) that the phone sends