16 pages...including hardware specs, overview, LED indicators...Installation instructions and Basic Configurations...by Yeastar.
MyPBX U100 is a 1U rack mount model IP PBX for up to 25 concurrent calls and
100 users.
MyPBX U200 supports up to 50 concurrent calls and 200 users. Both
support PSTN, ISDN BRI lines, GSM/UMTS networks and VoIP.
The MyPBX U100 &
U200 offers interoperability with mainstream IP Phone brands such as Yealink,
Snom, Grandstream, Aastra, Polycom and Cisco.
Auto provisioning configurations for Yealink and Polycom IP phones
(and others) built-in for easy bulk registration.
The manual you came for is here to download.
MyPBX-U100andU200-Installation-Guide.pdf