I'm looking for a device that can receive GPS inside a building without the assistance of an external antenna (Frontier says they no longer allow external antenna), will provide traditional NTP services, and will provide a timing signal that my Metaswitch can work with.
GPS inside a building probably isn't going to work unless you have the antenna up against a window.
Look at CDMA NTP Servers like the EndRun Sonoma. They use the cellular network which requires accurate timing and has good building penetration.
- Ethan O'Toole