GW0221 User Manual
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Unregister on
Reboot
Default is “No.” If set to “Yes”, then the SIP user will be unreg i stered on reboot.
Register Expiration
This parameter allows th e user to specify the time freque ncy (in minutes) the
GW0221 refreshes its registration with the specified gatekeeper/SIP server. The
default interval is 60 minutes (or 1 hour). The maximum interval is 65535
minutes (about 45 days).
Local SIP Port
This parameter defines the local SIP port the GW0221 listens and transmits
signals. The default value for FXS port is 5060. The default value for FXO port is
5062.
Local RTP port
This parameter defines the local RTP-RTCP port pair the GW0221 will
listen and transmit signals. It is the base RTP port for channel 0. When
configured, channel 0 will use this port _value for RTP and the port_value+1 for
its RTCP; channel 1 will use port_va lue+2 for R TP and port_v alue+3 for its R TC P.
The default value for FXS port is 5004. The default value for FXO port is 5008.
Use Random Port
When set to “Yes”, this parameter will force random generatio n of both the local
SIP and RTP ports. This is usually necessary when multiple GW0221
are behind the same NAT.
NAT Traversal
This parameter defines whether the GW0221 NAT traversal mechanism will be
activated o r not. If ac tivated ( by choosing “Yes”) and a STUN server address is
also specified, then the GW0221 will automatically follow the STUN client
specifications. Under this mode, the embedded STUN client inside the GW0221
will attempt to detect if there is a (and 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 GW0221 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
GW0221 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.
Keep Connected
Interval
This parameter specifies how often the GW0 221 sends a blank UDP
packet to the SIP server in order to keep the “hole” on the NAT open.
Use NAT IP: NAT IP address used in SIP/SDP message. Default is blank.
Proxy-Require SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
Send DTMF
This parameter controls how DTMF events are transmitted. There are 3 ways:
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.
DTMF Payload
Type
This parameter sets the payload type for DTMF using RFC2833
Send Flash Event
This parameter allows users to control whether to send a SIP NOTIFY
message indicating that the phone’s Flash key has been pushed, or just to switch
to the voice channel when users press the Flash key.
Send Anonymous
If this parameter is set to “Yes”, the “From” header in outgoing INVITE message
will be set to anonymous, essentially blocking the Caller ID from displaying.
Audio Settings: