Feature	Centrex	PBX with ISDN PRI
Administration	Web based changes, limited user changes	Menu driven software
Authorization Codes	Not Available	Standard feature - per phone basis
Boss-Secretary Line Appearance	Requires expensive ISDN sets	Standard on digital sets
Call Accounting	Not Available	PC, software
Call Coverage (Overflow lines)	Requires ISDN phones, 2 lines	Standard feature digital sets, use "free" virtuals for overflow
Call Forwarding	Set by Admin software - dial in	User or Admin can set up
Call Park	Not Available	You can park a call and retrieve it at another phone
Caller ID	Costs extra, requires special phones	Standard with digital display sets
Conference Calling	Max 3 party	3 party standard, 8 or 32 party optional
Day/Night Toll Restriction	Not Available	Standard - office phones can be local only at night
E-911	Yes	Standard with ISDN PRI
Executive Barge-In	Not Available	Allows barge in to existing conversations
Feature phone maintenance	Done by Ameritech at extra cost	Point and click software for Admin
Flexible Station Numbering	Phone numbers assigned by Phone Co.	Flexible numbering that customer has a choice
Group Call	Not Available	You can ring up to 32 phones for emergencies etc.
Hands Free Answer Back ICM	Not Available	You can use talk-back inter-com for inside calls
Internal Zone Paging	Not Available	You can page through the speakers of the digital phones
Least Cost Routing	Optional	Standard
Message Waiting Lamps	Requires adapter	Standard, can have multiple lamps on digital phones
Music on Hold	Limited Options	Standard, multiple choices
Name Display	Not Available	Standard with display phones
Night Answer	Attendant sets call forwarding only	Flexible
Reverse Caller ID	Yes	Standard with ISDN PRI
Secretarial phones	Requires expensive ISDN lines	Standard digital sets, several choices
Speakerphones	Analog or ISDN phones	Digital Speakerphones or analog or IP
Speed Dialing	20-30 numbers per phone	Flexible, up to 100 per phone
Toll Restriction	Limited	Flexible, many options
Traffic Reports	Not Available	Standard
Unique extensions	Some Centrex shared to cut monthly costs	Each phone typically has unique number
Virtual Extensions	Not Available	You can have an additional extension to take/receive calls
Voice Mail connection	Requires extra Centrex lines $$$ and data circuit	Plugs into PBX
Voice Mail Message Lights	Requires special lights, extra data circuit $400	Standard with analog or digital phones
VOIP Integration	Not Available	Can connect phones with Cisco routers
Wireless phones	Can forward to cellular with monthly expense	NEC integrated wireless phones or user can forward