It can be done! I do it all the time and the trick is that you must work around the 16-digit maximum in station speed dials. In the example you show I'd probably set up a new phantom PERMANENTLY forwarded to the 11-digit outside number, ext no longer than 3 digits. Then on the original phantom cut it back to 3 digits max, pass 3 digits also. Set up your Sta Spd for 359, old phantom, pass#, 355, new phantom. Now everything fits in 16 digits.