Phone number length

Ok, I've searched around and can only find an old thread for the Gen II that is remotely related to this.

I'd like to access work voicemail that requires me to dial an access number, pause, enter a phone number, pause, enter a pin code. I've got it set up on my mobile phone without a problem and it works great. But when I try to transfer that number to the Prius system it says bluetooth fails.

I poked around a bit and figured I would enter it manually. But when I do it became clear what is going on - it ends up being longer than the prius allows in a single phone number entry.

I know other people must have a similar issue and am curious what workarounds you have done to get around this rather annoying limit on length of numbers?

Thanks!