Yealink SIP-T4X Administration Manual page 202

4. Enter the URL of the ACS in the ACS URL field.
5. Select the desired value from the pull-down list of Enable Periodic Inform.
6. Enter the desired time in the Periodic Inform Interval (seconds) field.
7. Enter the user name and password authenticated by the IP phone in the
Connection Request Username and Connection Request Password fields.
8. Click Confirm to accept the change.
IPv6 is the next generation network layer protocol, designed as a replacement for the
current IPv4 protocol. IPv6 is developed by the Internet Engineering Task Force (IETF) to
deal with the long-anticipated problem of IPv4 address exhaustion. IPv6 uses a 128-bit
address, consisting of eight groups of four hexadecimal digits separated by colons. VoIP
network based on IPv6 can ensure QoS, a set of service requirements to deliver
performance guarantee while transporting traffic over the network.
IP phones support IPv4 only addressing mode, IPv6 only addressing mode, as well as an
IPv4/IPv6 dual stack addressing mode.
IPv6 Address Assignment Method
Supported IPv6 address assignment methods:
Manual Assignment: An IPv6 address and other configuration parameters (e.g.,

DNS server) for the IP phone can be statically configured by an administrator.
Stateless Address Autoconfiguration (SLAAC): SLAAC is one of the most convenient

methods to assign IP addresses to IPv6 nodes. SLAAC requires no manual
configuration of the IP phone, minimal (if any) configuration of routers, and no
additional servers. To use IPv6 SLAAC, the IP phone must be connected to a
network with at least one IPv6 router connected. This router is configured by the
network administrator and sends out Router Advertisement announcements onto
Configuring Advanced Features
187