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FIRMWARE VERSION 1.0.4.23 GXP1100/GXP1105 USER MANUAL Page 26 of 46

ITSP (SIP) server before the account can be registered. After it is saved,

this will appear as hidden for security purpose.

Name

The SIP server subscriber's name (optional) that will be used for Caller

ID display.

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.

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 Expiration

Specifies the time frequency (in se

conds) that the phone sends

re-registration request before the Register Expiration. The default value

is 0.

Local SIP Port

Defines the local SIP port used to listen and transmit. The default value

is 5060.

SIP Registration Failure Retry

Wait Time

Specifies the interval to retry registration if the process is failed. The

default value is 20 seconds.

SIP T1 Timeout SIP T1 Timeout. The default setting is 0.5 seconds.

SIP T2 interval SIP T2 Interval. The default setting is 4 seconds.

SIP Transport Determines the network protocol used for the SIP transport. Users can