Grandstream Networks Grandstream GXV-3000 - Manual (Page 39)

GXV-3000 User Manual
Grandstream Networks, Inc.
- 39 -
NAT Traversal This parameter defines whether the GXV-3000 NAT traversal mechanism will
be activated or not. If activated (by choosing “Yes”) and a STUN server is also
specified, then the GXV-3000 will behave according to the STUN client speci-
fication. Under this mode, the embedded STUN client inside the GXV-3000
will attempt to detect if and what type of firewall/NAT it is sitting behind
through communication with the specified STUN server. If the detected NAT
is a Full Cone, Restricted Cone, or a Port-Restricted Cone, the GXV-3000 will
attempt to 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 GXV-3000 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.
Subscribe for MWI: Default is No. When set to “Yes” a SUBSCRIBE for Message Waiting Indica-
tion will be sent periodically.
Proxy-Require SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Voice Mail User ID When configured, user will be able to dial voice mail server 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
modes supported: 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.
Early Dial Default is No. Use only if proxy supports 484 response.
Dial Plan Prefix Sets the prefix added to each dialed number.
Enable Call Features Default is No. If set to Yes, Call transfer, Call Forwarding & Do-Not-Disturb
are supported locally provided ITSP’s SIP server supporting those features.
Session Expiration Grandstream implemented SIP Session Timer. The session timer extension en-
ables 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 will be terminated.
Session Expiration is the time (in seconds) at which the session is considered
timed out, if no successful session refresh transaction occurs beforehand. The
default value is 180 seconds.
Min-SE The minimum session expiration (in seconds). The default value is 90 sec-
onds.
Caller Request Timer If selecting “Yes” the phone will use session timer when it makes outbound
calls if remote party supports session timer.