User's Manual Part 2

Grandstream Networks, Inc. GXV3175 USER MANUAL Page 42 of 68
FIRMWARE VERSION 1.0.0.32 Updated : 11/2010
Tel URI The default setting is “Disable”. If the Video phone has an assigned
PSTN number, this field should be set to “Enable”. If “User=Phone” is
set, a “User=Phone” parameter will be attached to the “From header”
in the SIP request to indicate the E.164 number.
Account/Network Settings
Outbound Proxy IP address or Domain name of the Outbound Proxy, or Media Gateway, or
Session Border Controller. Used by the GXV3175 for firewall or NAT
penetration in different network environments. If a symmetric NAT is
detected, STUN will not work and ONLY an Outbound Proxy will work.
DNS Mode The default is set to A Record. If the user wishes to locate the server by
DNS SRV, the user may select SRV or NATPTR/SRV.
NAT Traversal This setting decides whether the NAT traversal mechanism is activated. If it
is set to “STUN” and STUN server is configured, the GXV3175 will route
according the STUN server. In this mode, the STUN client embedded in the
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