Yealink SIP-T2 SERIES Administrator's Manual page 776

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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.
Because Internet Protocol version 4 (IPv4) uses a 32-bit address, it cannot meet the
increased demands for unique IP addresses for all devices that connect to the Internet.
Therefore, Internet Protocol version 6 (IPv6) is the next generation network layer
protocol, which 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. Yealink IP Phone supports IPv4
addressing mode, IPv6 addressing mode, as well as an IPv4&IPv6 dual stack
addressing mode. IPv4 uses a 32-bit address, consisting of four groups of three decimal
digits separated by dots; for example, 192.168.1.100. IPv6 uses a 128-bit address,
consisting of eight groups of four hexadecimal digits separated by colons; for example,
2026:1234:1:1:215:65ff:fe1f:caa.
VoIP network based on IPv6 can provide end-to-end security capabilities, enhanced
Quality of Service (QoS), a set of service requirements to deliver performance
guarantee while transporting traffic over the network.
If you configure the network settings on the phone for an IPv6 network, you can set up
an IP address for the phone either by using SLAAC (ICMPv6), DHCPv6 or by manually
entering an IP address. Ensure that your network environment supports IPv6. Contact
your ISP for more information.
IPv6 Address Assignment Method
Supported IPv6 address assignment methods:
Manual Assignment: An IPv6 address and other configuration parameters (e.g.,
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