Patent ID: 7894406

Claim:
A method for routing an emergency call from an internet protocol (IP) telephone to a Public Safety Answering Point (PSAP), the method comprising: (a) establishing a session over an IP network between a an IP telephone and a network node associated with the IP network, such that the IP telephone and network node access a Public Switched Telephone Network (PSTN) via a telecommunications switch, the network node and the telecommunications switch serving a first geographic region associated with a first PSAP different than a second geographic region where the IP telephone is currently located, the second geographic region associated with a second PSAP; (b) identifying at the network node a telephone number for the second PSAP serving the second geographic region in which the IP telephone is located; (c) forwarding the identified PSAP telephone number to the IP telephone; (d) storing the identified telephone number at the IP telephone for later use should an emergency call be placed; and, (e) substituting the identified telephone number for a dialed telephone number when the dialed telephone number is indicative of an emergency call, such that the IP telephone makes the substitution upon a user dialing an emergency telephone number associated with the emergency call.