Patent ID: 8774170

Claim:
A method, comprising: receiving, from a caller, a call placed to a local telephone number; identifying a toll free number corresponding to the local telephone number; determining whether the toll free number is associated with a first call center for a customer using voice over Internet protocol (VoIP) trunking to route calls to the first call center; identifying a dialed number identification service (DNIS) number corresponding to the toll free number; forwarding the call and the DNIS number to the first call center via a VoIP trunking connection, in response to determining that the toll free number is associated with the first call center for the customer using VoIP trunking to route calls to the first call center; and forwarding the call and the DNIS number to a second call center via a public network, in response to determining that the toll free number is not associated with a first call center for a customer using VoIP trunking to route calls to the first call center.