Transfer-to c-number message triggering of a routing request message within a cellular telephone network

In a cellular telephone network including a present switching node handling a call dialed to a B-number, a home location register storing transfer-to C-numbers for the dialed B-number, and a serving switching node serving a certain one of the C-numbers, a method for effectuating a call transfer set-up for the call, comprising the steps

• responsive to a redirection initiator for the call, transmitting a transfer-to C-number request from the present switching node to the home location register, the transfer-to C-number request including the B-number and an origination point code for the present switching node;
• processing in the home location register of the B-number to retrieve the certain C-number;
• proceeding in the home location register of the origination point code to determine an identification number for the present switching node;
• processing in the home location register of the certain C-number, without having previously returned the C-number to the present switching node, to determine the serving switching node;
• and
• transmitting a routing request from the home location register to the serving switching node to pre-route the call for transfer to the C-number, the routing requesting including the identification number for the present switching node as determined from the processing of the origination point code for the transfer-to C-number request.

In a cellular telephone network including a present switching node for a call dialed to a B-number, a first home location register storing transfer-to C-numbers for the dialed B-number, a serving switching node serving a certain one of the C-numbers, and a second home location register to which the certain C-number is assigned, a method for effectuating a call transfer set-up for the call, comprising the steps of:

• responsive to a redirection initiator for the call, transmitting a transfer-to C-number request from the present switching node to the first home location register, the transfer-to C-number request including an identification of both the B-number and the present switching node;
• processing in the first home location register of the B-number to retrieve the certain C-number and determine an identification number for the present switching node;
• transmitting a signal from the first home location register to the second home location register, the signal including the certain C-number and the identification number for the present switching node;
• processing in the second home location register of the certain C-number to determine the serving switching node;
• and
• transmitting a routing request from the second home location register to the serving switching node to pre-route the call for transfer to the C-number, the routing requesting including the identification number for the present switching node.

A cellular telephone network, comprising:

• a present switching node handling a call dialed to a B-number, the present switching node generating, responsive to a redirection initiator for the call, a transfer-to C-number request including both the B-number and an identification number for the present switching node;
• a home location register storing transfer-to C-numbers for the dialed B-number and connected to receive the transfer to c-number request from the present switching node, the home location register processing the B-number to retrieve a certain one of the C-numbers for call transfer and generating a routing request, without having previously returned the C-number to the present switching node, including both the C-number and the identification number for the present switching node from the received transfer-to C-number request;
• and
• a serving switching node serving the certain C-number and having network connections with both the present switching node and the home location register, the serving switching node generating, in response to the routing request, a return signal for transmission to the present switching node identifying the serving switching node for transfer of the call to the C-number.

A cellular telephone network, comprising:

• a present switching node for a call dialed to a B-number, the present switching node generating, responsive to a redirection request for the call, a transfer-to C-number request including both the B-number and an origination point code for the present switching node;
• a home location register storing transfer-to C-numbers for the dialed B-number and connected to receive the transfer-to C-number request from the present switching node, the home location register processing the B-number to retrieve a certain one of the C-numbers for call transfer, and processing the origination point code to determine an identification number for the present switching node, and generating a routing request, without having previously returned the C-number to the present switching node, including both the C-number and the identification number for the present switching node;
• and
• a serving switching node serving the certain C-number and having network connections with both the present switching node and the home location register, the serving switching node generating, in response to the routing request, a return signal for transmission to the present switching node identifying the serving switching node for transfer of the call to the C-number.

A cellular telephone network, comprising:

• a present switching node handling a call dialed to a B-number, the present switching node generating, responsive to a redirection request for the call, a transfer-to C-number request including an identification of both the B-number and the present switching node;
• a first home location register storing transfer-to C-numbers for the dialed B-number and connected to receive the transfer-to C-number request from the present switching node, the home location register processing the B-number to retrieve a certain one of the C-numbers not assigned to the first home location register for call transfer, and processing the identification of the present switching node to determine an identification number for the present switching node;
• a second home location register to which the certain C-number is assigned, the second home location register receiving a signal from the first home location register containing the C-number and the determined identification number for the present switching node, and generating a routing request including both the C-number and the identification number for the present switching node;
• and
• a serving switching node serving the certain C-number and having network connections with both the present switching node and the first and second home location registers, the serving switching node generating, in response to the routing request, a return signal for transmission to the present switching node identifying the serving switching node for transfer of the call to the C-number.