In a follow-up to this article, National Emergency Number Association (NENA) announces model legislation for Multi-Line Telephone Systems  (in MTUs, like hotels, offices, etc., where the internal PBX has to add 911 info to the call about what room or suite number).

"On Thursday, February 19, 2009, the Executive Board of the National Emergency Number Association (NENA) approved an updated version of model legislation designed to help states develop statutes and rules requiring sufficiently precise caller location information for 9-1-1 calls made using Multi-Line Telephone Systems (MLTS). The model legislation would ensure that 9-1-1 callers can be located when dialing from a business, shared tenant facility, hotel, or similar enterprise environment. Reflected in the language of the model legislation are technological advancements made in recent years that enable the implementation of Enhanced 9-1-1 (E9-1-1) MLTS capabilities without imposing undue burdens on MLTS manufacturers, providers, and operators.

Currently, there is no federal E9-1-1 requirement for MLTS, and only sixteen states have taken on the issue, each with substantively varied prescriptions to the problem.