["Transform your analog telephone into a modern VoIP device with an integrated NAT router The Grandstream HT881 is a powerful analog telephone adapter (ATA) that makes it possible to integrate an analog telephone into a VoIP device. Ideal for home and office applications, it offers a cost-effective solution for using VoIP services with existing analogue telephones", "Supports 3 SIP profiles via 1 FXS port and 8 FXO ports", "Integrated NAT router with a maximum routing speed of 100 Mbit/s", "TLS and SRTP encryption technology to protect calls and accounts", "Automated deployment options via TR-069 and XML configuration files", "Supports 3-way voice conferencing per port", "Failover SIP server automatically switches to a secondary server if the connection is lost", "Supports T.38 Fax for Fax over IP", "Supports a variety of Caller ID formats", "Compatible with Grandstream's UCM series of IP PBXs for zero-configuration deployment", "Grandstream HT881 adapter", "Network cable", "12V DC power supply", "Quick guide"]