How do I forward my campus number to another campus number?

Phone Forwarding Instructions:

1. Dial “STAR 42”, wait for tone
2. dial number to be forwarded to ?x55555?
3. wait for tone, then hang up

Removing Phone Forwarding:

1. Go to host phone
2. Dial “STAR 43”, wait for tone, hang up

Note:
I tried forwarding to a non-campus phone number, and it didn’t work. The system seems to only accept the 5-digit extension.