User's Manual

GXV3240 User Manual
GXV3240 WEB GUI
Grandstream Co., Ltd
Software Version：1.0.0.11 Document Version：0.1
144
NAT Traversal
This parameter configures whether the NAT traversal mechanism is activated.
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.
Set this to "VPN" if OpenVPN is used.
Proxy-Require
A SIP Extension to notify the SIP server that the phone is behind a NAT/Firewall.
x-PDFDivision