Operation Manual

FIRMWARE 1.0.0.49 GXW42XX USER MANUAL PAGE 39 OF 54
SIP transport
User can select UDP or TCP or TLS. Please make sure you’re SIP Server or network
environment supports SIP over the selected transport method. Default is UDP.
NAT Traversal
This parameter defines whether the GXW42XX NAT traversal mechanism is activated or not.
If activated (by choosing “Yes”) and a STUN server is also specified, then the GXW42XX
performs according to the STUN client specification. Under this mode, the embedded STUN
client will detect if and wha
t type of firewall/NAT is being used. If the detected NAT is a Full
Cone, Restricted Cone, or a Port-Restricted Cone, the GXW42XX
will use its mapped public
IP address and port in all of its SIP and SDP messages.
If the NAT Traversal field is set to “Yes” with no specified STUN server, the GXW42XX
will
periodically (every 20 seconds) send a blank UDP packet (with no payload data) to the SIP
server to keep the “hole” on the NAT open.
DNS Mode
One from the 3 modes available for “DNS Mode” configuration:
-A Record (for resolving IP Address of target according to domain name)
-SRV (DNS SRV resource records indicates how to find services for various protocols)
-NAPTR/SRV (Naming Authority Pointer according to RFC 2915)
One mode can be chosen for the client to look up server.
The default value is “A Record”
Tel URI
The default setting is “Disabled”. If the phone has an assigned PSTN
Number, this field should be set to “User=Phone” then a
“User=Phone” parameter will be attached to the “From header” in the SIP
request to indicate the E.164 number. If server supports TEL URI format, then this option
needs to be selected.
SIP Registration
This parameter controls whether the GXW42XX needs to send REGISTER messages to the
proxy server. The default setting is “Yes”.
Unregister on
Reboot
Default is No. If set to “Yes”, the SIP user’s registration information is cleared on reboot.