Patent ID: 8774370

Claim:
A method for delivering callback numbers for emergency calls in a VoIP system comprising a VoIP network, said VoIP network comprising a VoIP switch, the method comprising the steps of: (a) providing a pool of callback numbers consisting of a plurality of individual DIDs; (b) providing a plurality of VoIP phones in the VoIP network, each phone being provided with a unique SIP URI and being serviced by said VoIP switch and capable of registration with said VoIP switch; (c) assessing when an emergency call is made by one of said VoIP phones; (d) at an emergency service provider system located outside of the VoIP network and communicating with said VoIP network via said VoIP switch, receiving said SIP URI from VoIP switch and temporarily binding a DID to said SIP URI for a predetermined amount of time when the emergency call is made from at least one of said phones if said SIP URI is not already bound to a DID, wherein said binding is performed outside of and independently of said VoIP network; and (e) marking said DID that is bound to said SIP URI as unavailable, wherein said marking is performed outside of said VoIP network.