Method of providing 911 service to a private branch exchange

1. A method providing 911 service to a private branch exchange, comprising the steps of:

a) determining if a 911 call has been placed at the private branch exchange,

b) when the 911 call has been placed, determining a telephone line originating the 911 call; and

c) selecting a predetermined outgoing telephone line associated with the originating telephone line.

2. The method of claim 1 , further including the steps of:

d) placing the 911 over the outgoing telephone line

e) routing the 911 call to a public safety answering point.

3. The method of claim 2 , further including the step of:

f) sending a location query to a location database.

4. The method of claim 1 , wherein step (a) further includes the steps of:

a1) selecting an internal telephone line;

a2) determining a location of a telephone associated with the internal telephone line;

a3) assigning an outgoing telephone line to the internal telephone line for a 911 call.

5. The method of claim 4 , further including the step of:

a4) repeating steps (a1) through (a3) for each internal telephone line.

6. The method of claim 4 , further including the step of:

a4) entering a location information associated with the outgoing telephone line in a location database.

7. A method providing 911 service to a private branch exchange, comprising the steps of:

a) entering a location information for an outgoing line from the private branch exchange;

b) determining a location of a telephone associated with each internal line of the private branch exchange; and

c) when the location of the telephone associate with the internal line corresponds with the location information, programming the private branch exchange to route a 911 call from the telephone over the outgoing telephone line.

8. The method of claim 7 , wherein step (a) further includes the step of:

a1) repeating step (a) for each outgoing line from the private branch exchange.

9. A method providing 911 service to a private branch exchange, comprising the steps of:

a) grouping a plurality of internal telephones coupled to a private branch exchange into a plurality of groups;

b) assigning a separate public telephone line coupled to the private branch exchange to each of the plurality of groups; and

c) entering a location information in a location database of a public safety answer point for each of the separate public telephone lines associate with one of the plurality of groups.

10. The method of claim 9 , further including the step of:

d) programming the private branch exchange to route a 911 call from any internal telephone in one of the plurality of groups over the assigned separate public telephone line.

11. The method of claim 9 , further including the step of:

d) receiving a 911 call at the private branch exchange;

e) determining a group associated with an internal telephone line placing the 911 call;

f) selecting an assigned public telephone line to place the 911 call.