>>Great. You've got to drop that modem back to command and tell it to dial again, like "ATDT 12345678" or whatever to give you a distinct cue. You are getting closer...
>
>As soon as the voice mail kicks in, sending that line forces the voice mail to react immediately saying that we haven't received your voice mail, blah, blah, ... <s>
>
>It must be a syntax issue.

Sounds to me like the digits are getting into the voicemail or ? Hmmm, what are you using for an initialization sequence on the modem - any? By default, it should originate in data mode and ignore anything after that until it hears the receiving modem...