15 pages...explains how to use Grandstream GXP phone with a Yeastar IP-PBX and includes...register with MyPBX, Phone provisioning via PnP, via DHCP, How to set up a HandyTone 386, HandyTone 486, ATA...by Yeastar.
Grandstream
has been making very popular SIP based phones for years. They match well
with many VoIP based systems and Asterisk. For the very best prices on
Grandstream IP phones from a reliable source (some with free shipping):
Grandstream IP Phones
The manual you came for is here to download.
Yeastar-Configuration-with-Grandstream-Phones-Guide.pdf
Yeastar-Configuration-with-Grandstream-Phones-Guide.pdf