Sip Settings - Grandstream Networks GAC2570 User Manual

Register Before DNS SRV Fail-over
NAT Traversal
Proxy-Require

SIP Settings

SIP Basic Settings
SIP Registration
Unregister before New Registration
Saved one until DNS TTL (Stay on
responding IP until DNS timeout):
In this mode, the device will resolve DNS
SRV records and tries to send the request
to the server having the lowest priority and
if it doesn't respond, it will move on to the
next IP until one of the servers responds,
once this happens the device 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):
In this mode, the device will send SIP
requests to the last responding IP, and it
doesn't failover/switchover to the next one
until this responding server is down.
Failback follows failback expiration
timer:
When selected, the device will send all
SIP messages to the current failover SIP
server or Outbound Proxy until the
failback timer expire server is down.
Note: This option is available when DNS
Mode is set to SRV or NAPTR/SRV only.
When this feature is enabled (default), the
device will register using the outbound
proxy when the SIP server is failed to get
the registration.
Note: This option is available when DNS
Mode is set to SRV or NAPTR/SRV only.
Specifies which NAT traversal mechanism
will be enabled on the device. 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 the STUN server is
configured, the device will periodically
send STUN messages to the STUN 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
device will send the STUN packets to
maintain the connection that is first
established during the registration of the
device. 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 GAC2570.
If it needs to use OpenVPN to connect
host server, it needs to set it to "VPN".
The default setting is "Keep-alive".
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.
Allows the device to send SIP REGISTER
messages to the proxy/server. The default
setting is "Yes".
Controls whether to clear SIP user's
information by sending an un-register
request to the proxy server.