Abstract: A telephone network includes one or more end office switches not directly connected by a trunk line to a 911-type emergency tandem switch to handle emergency telephone calls. For those end office switches not so connected, a received emergency “9-1-1”-type telephone call is routed to a gateway switch having a trunk line connected to the emergency tandem. In the network, a first gateway switch connected to the emergency tandem switch provides the primary link, while a second gateway switch connected to the emergency tandem switch provides the secondary link. Routing information resident in end office switches is sent to the switch network to facilitate proper handling of an emergency call. The disclosed telephone network allows for less than full connectivity between gateway switches and an emergency tandem switch, while still providing a measure of redundancy to help ensure that an emergency call is completed.

Abstract: A method is provided to distinguish local exchange communication services provided by an interexchange carrier from other services offered by the interexchange carrier. The local exchange service typically is provided to a customer with whom the interexchange carrier provides a direct connection. For each call, a terminating switch receives a code identifying a type of service assigned to the call. The code may contain a local service identifier associated with a call that identifies the call is identifying a type of service assigned to the call. The switch determines whether the call is a POTS call and whether the code includes the local service identifier. If both conditions are met, the terminating switch generates the billing record provided the customer is a subscriber to the local service offered by the carrier.