[cisco-voip] Auto Call Pickup discard the zeros

[Stift]

I have set Auto Call Pickup to the Value True and when I pickup now a 
call from a phone all Zeros from the begin of a number with will discard.

Example:

I call from my cell phone (0173.....) to my colleague (on his phone I 
see my number with a second zero for the outside dial (00173......), 
then I press pickup and on my phone only see 173......

When set Auto Call Pickup back to the Value False, then everything works 
  fine and I see all zeros.

Any Ideas or Solutions?