Next APRS satellite has APRStt (DTMF and Voice) too:

Launch maybe this summer: http://aprs.org/qikcom-2.html

Here are some recordings of our next QIKCOM-2 satellite which in addition to APRS on 145.825 digipeating also lets any user with a DTMF keypad to uplink his GRID, QSL’s and other messages on a different VHF uplink. It gets converted to voice for the DTMF listeners and to APRS on the APRS downlink so it gets into the global APRS system on http://pcsat.findu.com

Grid: http://aprs.org/QIKcom/voice/Grid-FM19.wma

Then the manual entry of the contact number:

http://aprs.org/QIKcom/voice/QSL-fast.wma

Then an example of a message:

http://aprs.org/QIKcom/voice/message-73.wma

The voice sucks, but our next satellite http://aprs.org/psat-2.html after this one uses a better synthesizer.

Bob, WB4APR