Grandstream HT841 Analog Gateway

The HT841 combines two jobs in one small unit. Its four FXO ports connect up to four analogue landlines to an IP PBX or a hosted VoIP service, and its single FXS port connects an analogue phone, a fax machine or a door phone to the same system. It is a neat fit for a branch office or shop that keeps a few landlines and one analogue device.

The lifeline feature is the safety net: if power fails, the FXS port is relayed straight onto an FXO line, so the analogue phone can still make and receive calls through the exchange. Grandstream also provides a failover SIP server, 3-way conferencing on each port and three SIP profiles, plus T.38 fax and HD-capable codecs including Opus.

The gateway has two gigabit ports, one of which accepts 802.3af PoE, so it can be powered from a PoE switch without an adapter (12 V DC also works; no adapter is in the box). It doubles as a small NAT router. Provisioning can be automated and encrypted through TR-069 or AES-protected files, and calls can use TLS and SRTP. It measures 190 x 100 x 28 mm and weighs 460 g.