Panasonic KX-TDA100 Features Manual page 169

These PSs will ring individually when a call is directed to their assigned extension numbers (programming
not shown here).
PS Ring Group 2
PS 3, PS 4, and PS 5 will ring simultaneously when a call is directed to floating extension number 302, and,
in the case of a CO line call, will display "Sales 2".
These PSs will ring individually when a call is directed to their assigned extension numbers (programming
not shown here).
ICD Groups vs. PS Ring Groups
Assigning PSs to either an ICD group or a PS ring group will allow multiple PSs to receive group calls
simultaneously. The differences between the two are highlighted below:
Members can ring simultaneously when a call is received
Calls can be distributed to member extensions using different
methods
The CS is less likely to be busy; ringing all member PSs uses only
one CS channel
Members can log-in, log-out, and use Wrap-up time, G-DN button
Both PTs and PSs can belong to the same group
Each member can belong to more than one group
Calls can wait in a queue if they cannot be answered
Features
1.22 Portable Station (PS) Features
PS Ring Group ICD Group
Feature Guide 169