NAT Traversal
Specifies which NAT traversal mechanism will be enabled on the phone system. It can be selected
from the dropdown list:
NAT NO
STUN
Keep-alive
UPnP
Auto
OpenVPN®
If the outbound proxy is configured and used, it can be set to “NAT NO”.
If set to “STUN” and STUN server is configured, the phone system will periodically send STUN
message to the SUTN server to get the public IP address of its NAT environment and keep the NAT
port open. STUN will not work if the NAT is symmetric type.
If set to “Keep-alive”, the phone system will send the STUN packets to maintain the connection that
is first established during registration of the phone. The “Keep-alive” packets will fool the NAT
device into keeping the connection open and this allows the host server to send SIP requests
directly to the registered phone.
If it needs to use OpenVPN to connect host server, it needs to set it to “VPN”. If the firewall and the
SIP device behind the firewall are both able to use UPNP, it can be set to “UPNP”. The both parties
will negotiate to use which port to allow SIP through. The default setting is “Keep-alive”.
Proxy-Require
Adds the Proxy-Required header in the SIP message. It is used to indicate proxy-sensitive features
that must be supported by the proxy. Do not configure this parameter unless this feature is
supported on the SIP server.
Table 20: Account/SIP/General Settings
SIP Basic Settings
SIP Registration
Allows the phone system to send SIP REGISTER messages to the proxy/server.
The default setting is “Yes”.
Unregister before
New Registration
Controls whether to clear SIP user’s information by sending un-register request to the proxy server.
When set to “All”, the un-registration is performed by sending a REGISTER message with
“Contact” header set to * and Expires=0 parameters to the SIP server when the phone starts
pre-registration after rebooting.
If set to “Instance”, the phone only cleans the current SIP user’s info by sending REGISTER
message with “Contact” header set to concerned SIP user’s info and Expires=0 parameters to
the SIP server.
The default setting is “Instance”.
Register Expiration
(m)
Configures the time period (in minutes) in which the phone refreshes its registration with the
specified registrar. The default setting is 60.
The maximum value is 64800 (about 45 days).
Subscribe
Expiration (m)
Specifies the frequency (in minutes) in which the phone refreshes its subscription with the specified
registrar. The maximum value is 64800 (about 45 days).
Default value is 60.
Re-register before
Expiration (s)
Specifies the time frequency (in seconds) that the phone sends re-registration request before the
Register Expiration. The default setting is 0.
The range is from 0 to 64,800.
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