Network Settings - Grandstream Networks GSC3505 Series User Manual

Indicates E.164 number in "From" header by adding "User=Phone" parameter or using "Tel:" in SIP packets, if
the device has an assigned PSTN Number.
Disabled: Will use "SIP User ID" information in the Request-Line and "From" header.
Tel URI User=Phone: "User=Phone" parameter will be attached to the Request-Line and "From" header in the
SIP request to indicate the E.164 number. If set to "Enable".
Enabled: "Tel:" will be used instead of "sip:" in the SIP request.
Please consult your carrier before changing this parameter. Default is "Disabled".
Network
Settings
Configures the IP address or the domain name of the primary outbound proxy, media gateway or session
Outbound
border controller. It's used by the device for firewall or NAT penetration in different network environments.
Proxy
If a symmetric NAT is detected, STUN will not work and only an outbound proxy can provide a solution
Secondary Sets IP address or domain name of the secondary outbound proxy, media gateway or session border
Outbound controller. The device will try to connect the Secondary outbound proxy only if the primary outbound proxy
Proxy fails.
Defines which DNS service will be used to lookup IP address for SIP server's hostname. There are three
modes:
A Record
DNS Mode
SRV
NATPTR/SRV
To locate the server by DNS SRV set this option to "SRV" or "NATPTR/SRV". Default setting 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 device will always prefer to send SIP requests to the available server having the lowest priority, and in
case it's down it contacts the next one, but once the server having lowest priority is UP again, the device will
switch over to this one.
DNS SRV
Saved one until DNS TTL (Stay on responding IP until DNS timeout):
Fail-over
Mode
On this mode, the device will resolve DNS SRV records and tries to send the request to the server having
lowest priority and if it doesn't respond, it will move on to the next IP until one of the servers responds,
once this happen 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):
On 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.
Register
Before DNS When this feature is enabled (default), the device will register using the outbound proxy when the SIP server
SRV Fail- is failed to get the registration.
over