Synapse Administrator s Guide Advanced American Telephones. If you select NTP Server, the manual time and date settings disappear from the screen.For information on installing corded or Cordless Headsets, see the Synapse System Installation Guide at telephones.att.com/synapseguides. Synapse Installation Guide Battery Installation Install the battery as shown below. For optimal performance, charge the Headset battery for at least six hours To install the Synapse system correctly, follow the Recommended Installation Sequence described on the following pages. If you have non-Synapse devices that In this manual, all top-level settings (ones with no indentation) are identified at the beginning of their section (i.e. "Config option: example_setting ") and