Telstra Call forward codes
enable is done with *<code><number>#, cancel is done with #<code>#. The various codes are;
- *21<number># -- call forward
- *24<number># -- call forward if buisy
- *61<number># -- call forward no answer (after 5 rings)
I found a more complete list here
Rotary tricks
You can "add a line" to a rotary by doing a call-forward-if-buisy on the main rotary line to another line not in the rotary group. The call will be forwarded only if all lines in the group are buisy. Note that call-forwarding costs you a local call for each call.