Grandstream HT802 incl. P/S

Voice over IP (VoIP) Analog Telephone Adapter (ATA)
Supports 1 SIP profile through a single 10/100Mbps port
TLS and SRTP security encryption to protect calls and accounts
Automated provisioning options
Supports 3-way voice conferencing
Failover SIP server automatically switches servers
Supports T.38 Fax for creating Fax-over-IP
Supports a wide range of caller ID formats
Supports call transfer, call forward, call-waiting, do not disturb etc