D-Link DSL-G2452GR User Manual page 281

DSL-G2452GR AC1200 MU-MIMO Wireless Dual Band
VDSL2 Router with ADSL2+/3G/LTE/Gigabit Ethernet WAN
Support, 2 FXS Ports and USB Port
User Manual
Parameter
Support PRACK
Registration expire
timeout
Registration retry
interval
Session expires
Session refresher
Session update method
NAT keep alive
NAT support interval
Common Settings
Move the switch to the right to enable the PRACK method
(Provisional Response ACKnowledgement). The PRACK method
provides reliable transmission of packets with provisional responses
to an initiating request upon setting a session in accordance with
RFC3262.
Registration
A time period (in seconds) after which the router changes the
registration status in case of no response from the SIP proxy server.
A time period (in seconds) after which the registration will be
repeated.
A time period (in seconds) between attempts to check the status of
the voice session.
From the drop-down list, select the preferred choice of checking the
Internet connection state during the voice session.
Local: The router sends special SIP packets for checking the
•
Internet connection state.
Remote: The SIP proxy server sends special SIP packets for
•
checking the Internet connection state.
Auto: The SIP proxy server defines which party checks the
•
Internet connection state.
The voice session update method. Contact your ISP to clarify which
value needs to be selected.
NAT
Move the switch to the right to allow the router to support the state
of automatically forwarded ports by periodic exchange of service
messages. If the switch is moved to the right, the NAT support
interval field is available for editing.
The time interval (in seconds) between service messages. Specify
the needed value.
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Configuring via Web-based Interface
Description