How do I set up dialling and memory lists?

Let's assume you have a telephone with 2 buttons: memory 1 for information, memory 2 for emergency.  You want the emergency button to call "888" only.  You want the information button to call the information desk, or if that is busy the security office, or failing that the administration centre on 223344.
First set up the 4 possible user agents (end points) as memories on the memories page (it doesn't matter which end point is in which memory):

Note that comfort strings have been set to give the user confidence that "dialling" is taking place when the button is pressed.
Then set up 2 memory lists, one for each button:

Memory list 1 relates to memory button 1, and will dial memories 2, 3 and 4 in cascade.  Memory list 2 is for memory button 2, and will dial memory 1 only.
Note that, in this case, WAKEANDDIAL is set for both - the normal case for help point and hands-free telephones.
Refer to the Dialling & Memories pages in the Installation and User Guide for more details.