We have a lot of Vodavi STS, XTS customers and this is when we get a bunch of calls about how to to do this. Here are the instructions:
If you know which phone is programmed as your attendant phone, you can go there and do the following. The attendant phone is usually station 100.
1) Press the on/off button
2)If you hear intercom tone, proceed to step 4, if you hear dial tone then proceed to step 3
3)Press the top left flex key on your phone, you should now hear intercom tone
4)dial 692
5)Enter in the 2 digit month, day, year, and 4 digit minute
For example March 1, 2012 1pm would be: 03 01 12 1300
6) Press Hold
That's it!. If you have questions, please feel free to give me a call.
Adam Stern

410-239-2227 direct
astern@absphones.com
www.absphones.com