1. A method for operating a gateway mobile switching center to execute an emergency callback to a mobile device, the method comprising: processing, at the gateway mobile switching center, an emergency callback received from a public safety answering point in response to an unexpected release of an established emergency call between the public safety answering point and the mobile device to reestablish communication between the public safety answering point and the mobile device; issuing, at the gateway mobile switching center, a special-use send routing information message to a home location register, the special-use send routing information message comprising a parameter to suppress a call blocking feature enabled for a calling party of the emergency call; processing, at the gateway mobile switching center, a send routing information response message received from the home location register in response to the special-use send routing information message, the send routing information response message comprising a mobile station roaming number; and routing, at the gateway mobile switching center, the emergency callback to a serving mobile switching center based upon the mobile station roaming number.