In this review we will introduce the Grandstream HandyTone-488 Analog Telephone Adapter, one of the best adapters in the HandyTone ATA series.
When I took a first look at the device, it seemed small and good looking.
The design is very good, because of its simplicity and small size. It has one PHONE port, one LAN port, one WAN port, one LINE port and one power button.
It is black in color, with white inscriptions and one white button on top of the device.
At the bottom you can find some information about your device such as the input power - +5V ~ 1.2A, the exact model and the country it is made in. You also can find the MAC address and bar code. There are four legs to keep the device steady on surfaces, and in comparison with Grandstream HandyTone-502, these legs are very stable. I didn't break any during its using.
Many Internet information sites say that HT-488 is a step up from the Grandstream Handytone-486. There is one well-known bug of HandyTone-488 , featuring in many Grandstream products. The "early dial" feature does not work. E.g. if you want it to pass each dialed digit to the PBX as it is pressed rather than taking your whole number (followed by the '#" key or a 4-second timeout) before sending to the PBX, it wouldn't work. With Asterisk, pressing the 2nd digit with early dial enabled, causes an instant dial failure.
One interesting issue about Grandstream HandyTone-488 is for the incoming PSTN calls, which must ring the FXS port at least once before being forwarded to VoIP.
As far as the configuration of the device is concerned, I can say that it is easy for handling and configuring. There are “Basic settings”, “Advanced Settings”, also pages for setting the “FSX Port” and “FXO Port”.The configuration is simple, you have to follow the steps listed in Grandstream HandyTone-488 tutorial and shouldn't have any serious troubles with the configuration and use.