Manuals and User Guides for Grandstream Networks GXP2160 IP Telephone. We have 40 Grandstream Networks GXP2160 IP Telephone manuals available for free PDF download: Administration Manual, User Manual, Quick Installation Manual, Quick Start Manual, Phonebook Manual, Quick Reference Manual, Bluetooth User Manual, Setup Manual, Operation Manual, Basic Instructions, Quick Reference Sheet, Basic Operation Manual, Specifications, Quick User Manual