How to set intercom to answer automatically?

[strobesnmore]

When using the intercom between phones we want them to auto answer instead of ringing and having to pick up the receiver. We have one phone in our warehouse that is particularly important to set up this way so we can check stock without someone having to run to pick up the phone.

We are using the T28P with firmware 2.61.0.81

Anyone know how to set this up?