Grandstream Networks, Inc. GXP21xx User Manual Page 34 of 41
Firmware version: 1.0.1.66 Last Updated: 05/2011
NAT Traversal
This parameter activates the NAT traversal mechanism. It has options: No, STUN,
Keep-Alive, UPnP, Auto, VPN.
If selecting STUN and a STUN server is also specified, the phone perf orms
according to the STUN client specification. Using this mode, the embedde d STUN
client detects if and what type of NAT/Firewall configuration is used. If t he detected
NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the phone wi ll use
its mapped public IP address and port in all of its SIP and SDP mes sages.
If selecting Keep-Alive with no specified STUN server, the GXP21xx will perio dically
(every 20 seconds or so) send a blank UDP packet (with no payload data) t o the
SIP server to keep the “hole” on the NAT open.
SUBSCRIBE for MWI
Default is “No”. When set to “Yes” a SUBSCRIBE for Message Waiting Indicati on
will be sent periodically.
PUBLISH for Presence
Enable Presence feature.
Proxy-Require
SIP Extension to notify SIP server that the unit is behind the NAT/Fire wall.
Voice Mail UserID
When configured, user can access messages by pressing “MSG” button. This ID is
usually the VM portal access number.
Send DTMF
This parameter specifies the mechanism to transmit DTMF digit. There are 3
supported modes: in audio which means DTMF is combined in audio signal (n ot
very reliable with low-bit-rate codec), via RTP (RFC2833), or via SIP I NFO.
DTMF Payload Type
Sends DTMF using RFC2833. The default is 101.
Early Dial
Default is “No”. Use only if proxy supports 484 responses.
Dial Plan Prefix
Sets the prefix added to each dialed number.