Question : Problem: Need copy of EIA / TIA IS-101 voice modem commands?

I've been wrestling with DTMF and Tone Generation using my Voice Modem. The syntax is:

AT+VTS=    

The manual for the modem says "Specifications for the format of tone strings are detailed in IS-101".

1. Where can I find a copy of the EIA / TIA IS-101 voice modem commands without having to pay the $100 USD specified at http://www.tiaonline.org/standards/search_results2.cfm?document_no=TIA%2FEIA%2FIS%2D101

2. My VB6 program uses an MScomm control to dial a phone number and navigate the auto-attendent that answers. The "navigate auto-attendent" part uses a command like this, where "1" is the DTMF digit being sent to the auto-attendent, and 24 is the duration:

MSComm1.Output = "at+vts={1,24}" & Chr(13)

This works fine for the digits 1,2,3,4,5,6,7,8,9,#, and *. But, it does nothing when I try to dial a zero:

MSComm1.Output = "at+vts={0,24}" & Chr(13)

What am I doing wrong with the "dial zero" case?

Answer : Problem: Need copy of EIA / TIA IS-101 voice modem commands?

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