Optiset E ISDN Adapter
An industry exclusive, the Optiset E is the only digital phone that can be upgraded to support an ISDN BRI device with the addition of an Easy-Add option module. Snap the adapter into the module bay of the Optiset E Basic, Advance and Advance Plus phones, and you're ready to enjoy high-speed video and data transmissions at your desktop. Since one or two directory numbers can be assigned for independent operation, the phone number for the Optiset E is different from the number assigned to the ISDN Adapter. Both bearer channels are available over one RJ45 connector.
Requires Non-Routine Software Change.