 
            The Grandstream HT802 is an Analog Telephone Adapter (ATA) that allows analogue phones to be used with Vonage. A Factory Reset is needed when used with a prior service or moving to a different extension.
NOTES:
Before you set up your phone, it must be added to your account if purchased through a third party.
| Add Device/Phone to Account | Devices purchased from Vonage are already added to the account, but not set up or assigned to any specific extension. See the next section, Assign Extension to Device/Phone, to complete the setup.  Devices added to the account can either be: 
 | 
| Add Devices to Account that Were Purchased from a Third Party | 
 NOTE: After saving the new device, it appears in the table on the Devices tab. The Assignment is listed as Unassigned until an extension is set to the device. | 

| One-Way or No-Way Audio | Disable SIP ALG and the SPI firewall. | 
| ATA Not Powering On | Check that the ATA is plugged in and powered on by an AC power adapter. | 
| Unable to Make Outbound Calls | Disable SIP ALG and the SPI firewall. | 
| Calls Drop After a Few Seconds or Minutes | Disable SIP ALG and the SPI firewall. |