Grandstream Networks GXP21 Series User Manual page 35

NAT Traversal
SUBSCRIBE for MWI
PUBLISH for Presence
Proxy-Require
Voice Mail UserID
Send DTMF
DTMF Payload Type
Early Dial
Dial Plan Prefix
Grandstream Networks, Inc.
www.InternetVoipPhone.co.uk | sales@internetvoipphone.co.uk | 0800 088 4846
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 performs
according to the STUN client specification. Using this mode, the embedded STUN
client detects if and what type of NAT/Firewall configuration is used. If the detected
NAT is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the phone will use
its mapped public IP address and port in all of its SIP and SDP messages.
If selecting Keep-Alive with no specified STUN server, the GXP21xx will periodically
(every 20 seconds or so) send a blank UDP packet (with no payload data) to the
SIP server to keep the "hole" on the NAT open.
Default is "No". When set to "Yes" a SUBSCRIBE for Message Waiting Indication
will be sent periodically.
Enable Presence feature.
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
When configured, user can access messages by pressing "MSG" button. This ID is
usually the VM portal access number.
This parameter specifies the mechanism to transmit DTMF digit. There are 3
supported modes: in audio which means DTMF is combined in audio signal (not
very reliable with low-bit-rate codec), via RTP (RFC2833), or via SIP INFO.
Sends DTMF using RFC2833. The default is 101.
Default is "No". Use only if proxy supports 484 responses.
Sets the prefix added to each dialed number.
GXP21xx User Manual
Firmware version: 1.0.1.66
Page 34 of 41
Last Updated: 05/2011