9. A computer program product for recognizing a voice input received by an interactive voice recognition system, the computer program product comprising: a computer readable non-transitory storage media; first program instructions to receive an initial caller voice input from a caller, wherein the initial caller voice input is the caller saying an unintelligible phrase caused by a speech limitation of the caller; second program instructions to determine that the initial caller voice input is a computer-unintelligible voice input that does not match any entry from a lexicon of known voice inputs; third program instructions to prompt the caller to transmit a secondary input to clarify the computer-unintelligible voice input, wherein the secondary input is a dual-tone multi-frequency (DTMF) phone keypad input from the caller that identifies a user-requested activity that the caller was requesting when saying the unintelligible phrase; fourth program instructions to utilize the secondary input to match the computer-unintelligible voice input with a specific known voice input from the lexicon of known voice inputs; and fifth program instructions to update the lexicon of known voice inputs with the computer-unintelligible voice input, wherein the computer-unintelligible voice input is matched to the specific known voice input from the lexicon of known voice inputs; sixth program instructions to match the unintelligible phrase to the user-requested activity in a database that is specific for the caller; seventh program instructions to receive the unintelligible phrase in a subsequent phone call from the user; and eighth program instructions to match the unintelligible phrase to the user-requested activity for the caller; and wherein the first, second, third, fourth, fifth, sixth, seventh, and eighth program instructions are stored on the computer readable storage media.
9. A computer program product for recognizing a voice input received by an interactive voice recognition system, the computer program product comprising: a computer readable non-transitory storage media; first program instructions to receive an initial caller voice input from a caller, wherein the initial caller voice input is the caller saying an unintelligible phrase caused by a speech limitation of the caller; second program instructions to determine that the initial caller voice input is a computer-unintelligible voice input that does not match any entry from a lexicon of known voice inputs; third program instructions to prompt the caller to transmit a secondary input to clarify the computer-unintelligible voice input, wherein the secondary input is a dual-tone multi-frequency (DTMF) phone keypad input from the caller that identifies a user-requested activity that the caller was requesting when saying the unintelligible phrase; fourth program instructions to utilize the secondary input to match the computer-unintelligible voice input with a specific known voice input from the lexicon of known voice inputs; and fifth program instructions to update the lexicon of known voice inputs with the computer-unintelligible voice input, wherein the computer-unintelligible voice input is matched to the specific known voice input from the lexicon of known voice inputs; sixth program instructions to match the unintelligible phrase to the user-requested activity in a database that is specific for the caller; seventh program instructions to receive the unintelligible phrase in a subsequent phone call from the user; and eighth program instructions to match the unintelligible phrase to the user-requested activity for the caller; and wherein the first, second, third, fourth, fifth, sixth, seventh, and eighth program instructions are stored on the computer readable storage media. 12. The computer program product of claim 9 , wherein the secondary input is a caller's response to a menu of input options, wherein one of the input options identifies an input whose definition matches that of the specific known voice input from the lexicon of known voice inputs.