A communication system may include a plurality of conferencing endpoints at different locations and capable of being coupled to a telecommunication network, a respective near field communication (NFC) device associated with each conferencing endpoint, and a plurality of electronic devices. Each electronic device may be configured to register at one of the conferencing endpoints for a teleconference between the plurality of conferencing endpoints based upon communication with a respective NFC device associated with the one of the conferencing endpoints. At least one of the electronic devices may be further configured to provide a notification based upon a security level associated with another electronic device being registered for the teleconference.