In-band signaling for routing

Abstract

Telephone call routing in networks is provided by forwarding routing data other than origination identification and destination identification in-band with calls, and using the in-band data at call destinations to do further routing. In some embodiments negotiation is accomplished between routers at different points in the network based on the in-band routing data. Practice of the invention extends to intelligent telephony networks and as well to simulated telephone calls between computers in wide area data networks, such as the Internet and Intranets.

What is claimed is: 
     
       1. A method for routing a telephone call in a network comprising steps of:
 (a) attaining, at a service control point, routing data associated with the call other than origination identification or first destination identification; 
 (b) writing the routing data in-band, in a data field conventionally dedicated to information other than routing data, with the call to forward to a second network point serviced by a computer-telephony integration (CTI) system; 
 (c) accessing the routing data at the second network point by the CTI system; and; 
 (d) using the routing data to select a third network destination for the call. 
 
     
     
       2. The method of  claim 1  wherein, in step (a) the routing data other than origination identification or first destination identification is data elicited from a caller. 
     
     
       3. The method of  claim 1  wherein, in steps (c) and (d) the accessing and using is by a second router at the second network point, and wherein the first router and the second router negotiate routing path. 
     
     
       4. The method of  claim 1  wherein the network is a wide area data network, and the telephone calls are simulated calls is between two or more computer stations connected to the wide area data network. 
     
     
       5. The method of  claim 4  wherein at the first network destination point a first router writes routing data into one or more data fields in a data packet associated with the call, and forwards the data packet to a second destination point for further routing by a second router using the routing data. 
     
     
       6. A routing system for telephone calls in a network comprising:
 a first router associated with a service control point; and 
 a second router associated with a second network destination point serviced by a computer-telephony intergration integration (CTI) system; 
 wherein, for a call received at the service control point, the first router writes routing data other than call origination identification or first destination identification into one or more data fields in a data packet associated with the call conventionally dedicated to other than the routing data, and the second router at the second network destination point uses the routing data from the one or more data fields to further route the call, and 
 wherein the first router and the second router negotiate based on the data written by the first router into the one or more data fields. 
 
     
     
       7. The system of  claim 6  wherein the first router and the second router negotiate based on the data written by the first router into the one or more data fields. 
     
     
       8. The system of  claim 6  A routing system for telephone calls in a network comprising:
 a first router associated with a service control point; and 
 a second router associated with a second network destination point serviced by a computer-telephony integration (CTI) system; 
 wherein, for a call received at the service control point, the first router writes routing data other than call origination identification or first destination identification into one or more data fields in a data packet associated with the call conventionally dedicated to other than the routing data, and the second router at the second network destination point uses the routing data from the one or more data fields to further route the call, 
 wherein the first router and the second router negotiate based on the data written by the first router into the one or more data fields, and 
 wherein the network is a wide area data network, and the telephone calls are calls between two or more computer stations connected to the wide area data network rather than between telephones, the computers providing telephone functions. 
 
     
     
       9. The system of  claim 8  wherein the wide area data network is the Internet, and wherein the calls are Internet Protocol Network Telephony calls.