Translation patterns, in the following example a sets DN is 87032000, but 22000 also works due to a translation pattern.
Take 2.xxxx, delete left of the dot, and add a prefix of 8703. The dialed number 22000 will ring DN 87032000.

1. Enter the Translation Pattern, eg: 2.XXXX
2. Scroll down to Called Party Transformations, Discard PreDot (the 2) and add prefix 8703
3. Click SAVE and test