dtmf grammars questions

[vincent ribiere <ribiere@cisco.com>]

Hello,

I'm trying to use the recognition interface to receive DTMF digits sequences.

It works fine when I need to recognize single digits as the grammar is relatively simple:
for instance if I'm only expected 1,2 or 3 in a field, the following works fine:

<field name="main_choice">
      <dtmf> 1| 2 | 3 </dtmf>
</field>

But if I need to obtain a certain number of digits from the user (e.g. a phone number
with 10 digits), I run into problems as the following is not supported:

<field name ="extension"  type="digits?length=10" >
    <prompt> Enter the 10 digits extension of the user you want to reach
    </prompt>
 </field>

It seems I need a more elaborate support for grammars but does anyone know
a way of writing a grammar that supports the above (with the existing recognition
code) ?

As it seems unlikely, does anyone know of an open-source implementation of a
grammar (e.g. JSGF) that would allow to do this ?

Thanks in advance,

-- 
Vincent Ribiere
senior Engineer, Cisco Systems
(408) 527 6613