Planning for emergencies in an enterprise environment is very tricky business, plain and simple. It is particularly challenging when employees, guests, contractors and others are working behind a multiline telephone system (MLTS). In a widely quoted (but unsubstantiated) Department of Labor report, it has been estimated that no fewer than 60 million people work in multi-building campuses or high-rise buildings behind multiline telephone systems, including PBXs. Your company’s employees likely are included in that count.
The full text of this White Paper commissioned by CCMI can be downloaded here: 
Listen to Mark Fletcher and Martha Buyer discussing who should be involved in E911 planning activities in this podcast.