Grandstream Networks GSC35 Series User Manual page 36

Network Settings
Outbound Proxy
Secondary Outbound
Proxy
DNS Mode
DNS SRV Fail-over Mode
•
Disabled: Will use "SIP User ID" information in the Request-Line and
"From" header.
•
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".
Configures the IP address or the domain name of the primary outbound
proxy, media gateway or session border controller. It's used by the device
for firewall or NAT penetration in different network environments. If a
symmetric NAT is detected, STUN will not work and only an outbound
proxy can provide a solution
Sets IP address or domain name of the secondary outbound proxy, media
gateway or session border controller. The device will try to connect the
Secondary outbound proxy only if the primary outbound proxy fails.
Defines which DNS service will be used to lookup IP address for SIP
server's hostname. There are three modes:
• A Record
• 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.
• Saved one until DNS TTL (Stay on responding IP until DNS
timeout):
GSC35XX Series User Manual
Version 1.0.0.15
P a g e | 36