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A Grandstream HT8xx analog telephone adapter (ATA) connects analog devices, such as a fax machine or an analog handset, to your VOXO phone service. The adapter sits between your network and the analog device and registers to VOXO as a phone line.

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Which model do I have

The HT8xx family differs by how many analog (FXS) ports each model has. Each port maps to one analog device.
Some sites use one HT801 per fax machine so a single adapter failure only affects one machine.

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Connect the adapter

1

Connect the network

Plug an Ethernet cable from your network into the ATA’s network port.
2

Connect the analog device

Plug your fax machine or analog phone into one of the phone (FXS) ports.
3

Connect power

Connect power. The adapter pulls its configuration from VOXO automatically once it is online.
Confirm the link light on the network port lights up when the cable is connected. A lit link light means the adapter has a working network connection.

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If the adapter does not come online

An ATA that never registers is almost always a network problem rather than a faulty unit. Before assuming the hardware is bad:
1

Test the port with a laptop

Plug a laptop into the same Ethernet port. If the laptop cannot get online, the port is the problem.
2

Try a different port

Move the cable to a different switch or router port.
3

Try a new cable

Swap in a known-good Ethernet cable.
4

Check the link light

Confirm the link light on the ATA illuminates.
Contact support if the network port passes a laptop test and you have tried a different port and cable, but the adapter still has no dial tone or fax on any connected device.