Let’s look at Grandstream ATA HandyTone-502 Analog Telephone Adapter the latest product in the HandyTone ATA series and Grandstream VoIP product line.
This is Helen Hu from China Skyline which in the field of VoIP products, GSM Modem, sim bank and wifi phone. And also deal in routes .Urgent need non cli 92 pak direct route who has voip gateway .