Grandstream Networks HT818 Administration Manual page 46

DNS SRV Failover Mode
Failback Timer
Register Before DNS
SRV Failover
TEL URI
Use Request Routing ID
in SIP INVITE Header
Configure the preferred IP mode for DNS SRV or NAPTR/SRV. If "default" is
selected, first IP from query result will be applied; If "Saved one until DNS TTL" is
selected, previous IP will be applied before reaches DNS timeout; If "Saved one
until no response" is selected, previous IP will be applied even after DNS time out
until it's unreachable.
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Default
If the option is set with "default", it will again try to send register messages to one
IP at a time, and the process repeats.
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Saved one until DNS TTL
If the option is set to "Saved one until DNS TTL", it will send register messages to
the previously registered IP first. If no response, it will try to send one at a time for
each IP. This behavior lasts if DNS TTL (time-to-live) is up.
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Saved one until no responses
If the option is set with "Saved one until no responses", it will send register
messages to the previously registered IP first, but this behavior will persist until
the registered server does not respond.
When the primary SBC is up, device will send SIP requests to the primary SBC. If
at any point device fails over to the secondary SBC, the SIP requests will stay on
the failover SBC for the duration of the failback timer. When the timer expires,
device will send SIP requests to the primary SBC, (in minutes. Default is 60
minutes, max 45 days).
This feature is used to control whether the device need to initiate a new registration
request (following existing DNS SRV fail-over mode) first and then direct the non-
registration SIP request (INVITE) to the new successfully registered server or not.
Indicates E.164 number in "From" header by adding "User=Phone" parameter or
using "Tel:" in SIP packets, if the HT818 has an assigned PSTN Number.
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Disabled: Use "SIP User ID" information in the Request-Line and "From"
header.
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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".
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Enabled: "Tel:" will be used instead of "sip:" in the SIP request.
Please consult your carrier before changing this parameter. Default is Disabled.
If set to Yes, device will use the configured [Request URI Routing ID] in the SIP
INVITE. This option is usually used under a SIP trunk account's configuration.
Default is No.
HT818 Administration Guide
Version 1.0.27.2
P a g e | 45