Patent ID: 8218528

Claim:
A gateway, comprising: a circuit switched network interface to communicate with a circuit switched network; an Internet Protocol (IP) network interface to communicate with an IP network; a processor configured to send a first call invitation to an IP network device over the IP network interface, wherein the first call invitation is unsolicited with respect to a target thereof; the processor configured to send a second call invitation to a circuit switched network device over the circuit switched network interface, wherein the second call invitation is unsolicited with respect to a target thereof; and the processor configured to determine whether a response to the second call invitation is received over the circuit switched network interface or the IP network interface, to send a gateway address to the IP network device over the IP network interface if the response is received over the circuit switched network interface, to send contact information to the IP network device over the IP network interface if the response is received over the IP network interface; wherein if the contact information is sent over the IP network interface, the processor is configured to initiate a call between the IP network device and a remote device located in the IP network; and wherein if the gateway address is sent over the IP network interface, the processor is configured to initiate a call between the IP network device and the circuit switched network device.