Delivery of audio driving directions via a telephone interface

1. A method of capturing an address from a caller via a telephone interface, said method comprising:

setting a grammar;

audibly prompting said caller to provide an utterance representing said address;

receiving said utterance via said telephone interface;

verifying said utterance using said grammar; and

if said utterance matches multiple entries of said grammar, identifying said utterance from said multiple entries using a relative size threshold, wherein said identifying comprises:

determining a relative size of each street name entry matching said utterance; determining whether said relative size threshold is exceeded by relative size of any of street name entries; and

if said relative size threshold is exceeded by relative size of a particular street name entry, selecting said particular street name entry.

2. The method as recited in claim 1 wherein said grammar is set to one of city names, street names, and street numbers.

3. The method as recited in claim 1 wherein said verifying comprises:

if verification of said utterance is unsuccessful, playing an audio error message to said caller via said telephone interface.

4. The method as recited in claim 1 further comprising:

sending said address to a raw driving directions generator;

verifying said address with said raw driving directions generator;

if said verification of said address is unsuccessful, receiving an error message from said raw driving directions generator;

determining a helpful error message to provide to said caller via said telephone interface based on said error message; and

playing said helpful error message to said caller via said telephone interface.

5. A method of delivering audio driving directions via a telephone interface, said method comprising:

capturing an origin address and a destination address inputted by a caller via said telephone interface;

generating raw driving directions based on said origin and destination addresses;

generating formatted driving directions from identifying a maneuver in said raw driving directions; wherein the maneuver comprises at least one of a merge-type, turn-type, and exit-ramp type;

wherein said generating formatted driving directions comprises:

removing one or more redundant steps from said raw driving directions;

replacing one or more first steps from said raw driving directions;

consolidating one or more second steps from said raw driving directions; and

renumbering said steps of said raw driving directions to form said formatted driving directions;

generating said audio driving directions based on said formatted driving directions; and

playing to said caller said audio driving directions in response to a command provided by said caller.

6. A voice portal comprising:

a processor;

a memory for storing therein instructions which when executed perform a method of capturing an address from a caller via a telephone interface, said method comprising:

setting a grammar;

audibly prompting said caller to provide an utterance representing said address;

receiving said utterance via said telephone interface;

verifying said utterance using said grammar; and

if said utterance matches multiple entries of said grammar, identifying said utterance from said multiple entries using a relative size threshold, wherein said identifying comprises:

determining a relative size of each street name entry matching said utterance; determining whether said relative size threshold is exceeded by relative size of any of street name entries; and

if said relative size threshold is exceeded by relative size of a particular street name entry, selecting said particular street name entry.

7. The voice portal as recited in claim 6 wherein said grammar is set to one of city names, street names, and street numbers.

8. The voice portal as recited in claim 6 wherein said verifying comprises:

if verification of said utterance is unsuccessful, playing an audio error message to said caller via said telephone interface.

9. The voice portal as recited in claim 6 wherein said method further comprises:

sending said address to a raw driving directions generator;

verifying said address with said raw driving directions generator;

if said verification of said address is unsuccessful, receiving an error message from said raw driving directions generator;

determining a helpful error message to provide to said caller via said telephone interface based on said error message; and

playing said helpful error message to said caller via said telephone interface.