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FIRMWARE VERSION 1.0.1.38 GXV3175V2 USER MANUAL Page 55 of 138
phone will communicate with the appointed STUN server to examine which
type of Firewall/NAT setting is employed. If the type of NAT detected is Full
Cone, Restricted Cone or Port-Restricted cone, the phone will try to use
public IP addresses and port in all the SIP and SDP messages.
If the “NAT Traversal” is configured to be “Keep-alive”, the phone will send
an empty SDP packet (without payload data) to the SIP server once in 20
seconds to keep the NAT port open.
If VPN is used, users should select VPN for NAT Traversal.
Users could also set Auto or UPnP according to the network
configuration.
If an outbound proxy server is used, please configure this to be “NAT No”.
Proxy Require
Notifies the SIP server that the unit is behind a NAT/Firewall.
Account/SIP Settings
SIP Registration
Selects whether or not the GXV3175 will send a SIP Register message to
the proxy; The default setting is Yes.
Unregister On Reboot
If set to Yes, the SIP user registration messages will be cleared on reboot.
The default setting is Yes.
Register Expiration (m)
This defines the expiration time of the registration in minutes. The default
value is 50 minutes; the maximum value is 65535 minutes (approximately
45 days) and the minimum value is 5 minutes.
Wait Time Retry
Registration (s)
The wait time for registration retry if registration fails. The default is set to 20
Seconds.
Local SIP Port
The local SIP port for sending and receiving data. The default settings for
Account 1/2/3 are 5060/5062/5064.
SUBSCRIBE for MWI
Default is set to No. When selected, a SUBSCRIBE for Message Waiting
Indication will be sent out periodically.
Session Expiration (s)
Session Expiration is the time (in seconds) at which the session is
considered timed out if no successful session refresh transaction occurs
beforehand. The default value is 180 seconds.
MIN-SE (s)
The minimum session expiration (in seconds). The default value is 90
seconds.
UAC Specify Refresher
As a Caller, select UAC to use the phone as the refresher, or select UAS to
use the Callee or proxy server as the refresher.
UAS Specify Refresher
As a Callee, select UAC to use the caller or proxy server as the refresher, or
select UAS to use the phone as the refresher.
Force INVITE
The Session Timer can be refreshed using the INVITE or UPDATE
methods. Select Yes” to use the INVITE method to refresh the session
55


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