ANSWER : <say-as interpret-as="number_digit">
Per https://msdn.microsoft.com/en-us/library/dd450828(v=office.13).aspx
I have a simple field (shown below) to collect the callers 9 digit account number.
It works correctly in that it collects the number, and it reads it back. My problem is that when it reads back the number, it considers it a whole number. For example if they enter 111111111 it reads it as 111,111,111 (one hundred and eleven million..ect.)
Obviously I would like it to read back one digit at a time, example:
"You entered 1, 2, 3, ect. "
Here is my simple code:
<field name="accountnumber" type="digits?minlength=9;maxlength=9">
<prompt>
What is your 9 digit account number
</prompt>
<filled>
<prompt> You said <value expr="accountnumber"/> </prompt>
</filled>
</field>
You need to place your <value> inside a <say-as> tag:
<say-as interpret-as="digits">
<value expr="accountnumber"/>
</say-as>
The interpret-as attribute may somewhat depend on what your VXML engine supports. For example, Voxeo uses "digits", Microsoft seems to use "number:digit", and the SSML 1.0 spec says "characters". Some also use the attribute type instead of interpret-as.