Patent ID: 9621715
Date: 2017-04-11
CPC Classifications: H04L,H04M

Claim:
1. A method performed by a computer device, the method comprising: receiving, by the computer device, a Session Initiation Protocol (SIP) telephone call; identifying, by the computer device, the SIP telephone call as originating from a first toll-free telephone number and destined for a second toll-free telephone number; determining, by the computer device, a screened telephone number associated with the first toll-free telephone number, wherein the screened telephone number is assigned to the first toll-free telephone number by a provider network that carries SIP telephone calls between a SIP network associated with the first toll-free telephone number and a local exchange carrier network associated with the second toll-free telephone number; generating, by the computer device, a diversion header that includes the determined screened telephone number for the SIP telephone call, in response to identifying the SIP telephone call as originating from the first toll-free telephone number and destined for the second toll-free telephone number; and sending, by the computer device, the SIP telephone call to the local exchange carrier network associated with the second toll-free telephone number.