Handling redirect calls

An apparatus comprising:

• one or more processors;
• and
• logic encoded in one or more non-transitory tangible media for execution by the one or more processors and when executed operable to:
• receive, from a first device at a network device, a first call request directed to a second device;
• send the first call request from the network device to a redirect server;
• receive a redirection response at the network device from the redirect server indicating a redirection of a destination of the first call request from the second device to a third device, the redirection response comprising a third device address for the third device;
• based on receiving the redirection response from the redirect server, generate, using the network device, a redirection information for the first call, the redirection information being associated with the third device address and including a redirection identifier;
• store, using the network device, the redirection information;
• send a message from the network device to the first device, the message indicating a redirection of the first call request to the third device and comprising a respond-to address for the network device, the message also including the redirection identifier;
• receive a second call request from the first device at the network device, the second call request being addressed to the respond-to address for the network device and including the redirection identifier;
• identify, using the network device, the stored redirection information based on the redirection identifier included in the second call request;
• determine, using the network device and based on the identified redirection information, that the second call request is a redirection based on the first call request;
• and
• based on determining that the second call request is a redirection based on the first call request, send, using the network device, the second call request to the third device using the third device address that is obtained using the redirection information.

An apparatus comprising:

• means for receiving, from a first device at a network device, a first call request directed to a second device;
• and
• instructions encoded in a non-transitory machine-readable medium for execution by a processor, the instructions when executed by the processor cause the processor to perform operations including:
• sending the first call request from the network device to a redirect server;
• receiving a redirection response at the network device from the redirect server indicating a redirection of a destination of the first call request from the second device to a third device, the redirection response comprising a third device address for the third device;
• based on receiving the redirection response from the redirect server, generating, using the network device, a redirection information for the first call, the redirection information being associated with the third device address and including a redirection identifier;
• storing, using the network device, the redirection information;
• sending a message from the network device to the first device, the message indicating a redirection of the first call request to the third device and comprising a respond-to address for the network device, the message also including the redirection identifier;
• receiving a second call request from the first device at the network device, the second call request being addressed to the respond-to address for the network device and including the redirection identifier;
• identifying, using the network device, the stored redirection information based on the redirection identifier included in the second call request;
• determining, using the network device and based on the identified redirection information, that the second call request is a redirection based on the first call request;
• and
• based on the determining, sending, using the network device, the second call request to the third device using the third device address that is obtained using the redirection information.