Grandstream Networks, Inc - Grandstream Networks GXP-2020 User Manual

NAT Traversal
Subscribe for MWI:
Proxy-Require
Voice Mail User ID
Send DTMF
Early Dial
Dial Plan Prefix
Enable Call Features
Session Expiration
Min-SE
Caller Request Timer
Callee Request Timer
Force Timer
UAC Specify Refresher
UAS Specify Refresher

Grandstream Networks, Inc.

This parameter activates the NAT traversal mechanism. If activated (by choosing
"Yes") 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 the NAT
Traversal field is set to "Yes" with no specified STUN server, the GXP-2020 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.
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.
Default is No. Use only if proxy supports 484 response.
Sets the prefix added to each dialed number.
Default is No. If set to "Yes", Call transfer, Call Forwarding & Do-Not-Disturb are
supported locally provided ITSP support those features.
The SIP Session Timer extension enables SIP sessions to be periodically
"refreshed" via a SIP request (UPDATE, or re-INVITE. Once the session interval
expires, if there is no refresh via a UPDATE or re-INVITE message, the session is
terminated.
Session Expiration is the time (in seconds) at which the session is considered
timed out, provided no successful session refresh transaction occurs beforehand.
The default value is 180 seconds.
Defines the minimum session expiration (in seconds). Default is 90 seconds.
If set to "Yes", the phone will use session timer when it makes outbound calls if
remote party supports session timer.
If selecting "Yes", the phone will use session timer when it receives inbound calls
with session timer request.
If set to "Yes", the phone will use session timer even if the remote party does not
support this feature. If set to "No", the session timer is enabled only when the
remote party supports this feature. To turn off Session Timer, select "No" for
Caller Request Timer, Callee Request Timer, and Force Timer.
As a Caller, select UAC to use the phone as the refresher, or UAS to use the
Callee or proxy server as the refresher.
As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to
use the phone as the refresher.
GXP–2020 Users Manual
Firmware 1.1.4.3
Page 29 of 33
Last Updated: 05/2007