Grandstream Networks WP820 Administration Manual page 18

Display Name
Tel URI
Voice Mail Access Number
Network Settings
Outbound Proxy
Secondary Outbound Proxy
DNS Mode
DNS SRV Fail-over Mode
registered. After it is saved, this will appear as hidden for security
purpose.
Configures the SIP server subscriber's name (optional) that will be
used for Caller ID display.
Indicates E.164 number in "From" header by adding "User=Phone"
parameter or
using "Tel:" in SIP packets if the base has an assigned PSTN
Number.
● 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.
Defines the voice mail portal access number to allow users
accessing their voice messages.
Configures the IP address or Domain name of the Primary
Outbound Proxy, Media Gateway, or Session Border Controller. It is
used by the phone 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.
Configures the IP address or Domain name of the Secondary
Outbound Proxy, Media Gateway, or Session Border Controller.
Secondary outbound proxy will be used when the primary outbound
proxy fails.
Selects DNS mode to use for the client to look up server. One mode
can be chosen.
● A Record: resolves IP Address of target according to domain
name.
● SRV: DNS SRV resource records indicate how to find services
for various
3. protocols.
● 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