Account/Sip Settings - Grandstream Networks WP820 Administration Manual

DNS SRV Fail-over Mode
NAT Traversal
Proxy-Require

Account/SIP Settings

● NAPTR/SRV: Naming Authority Pointer according to RFC
2915.
Default is A Record.
The option will decide which IP is going to be used in
sending subsequent SIP packets (ex: Register refresh
requests) after the list of IPs for SIP server host is resolved
with DNS SRV.
● Default (prefer server with lowest SRV priority): The
phone will always prefer to send SIP requests to the
available server having the lowest priority, and in case it
is down it contacts the next one, but once the server
having lowest priority is UP again, the phone will switch
over to this one.
● Saved one until DNS TTL (Stay on responding IP until DNS
timeout): On this mode, the phone will resolve DNS SRV
records and tries to send the request to the server having
lowest priority and if it does not respond, it will move on
to the next IP until one of the servers responds, once this
happen the phone will keep contacting this responding IP
until DNS timeout (30 minutes) before starting over.
● Saved one until no response (Stay on responding IP until
its failure): On this mode, the phone will send SIP
requests to the last responding IP, and it does not
failover/switchover to the next one until this responding
server is down.
Specifies which NAT traversal mechanism will be enabled on
the phone. It can be selected from the dropdown list:
● NAT NO
● STUN
● Keep-alive
● 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
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 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 "OpenVPN". The default setting is "NAT NO".
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 12: Account/General Settings