Panasonic KX-TDA100D Features Manual page 242

1.21.1 Integrated Services Digital Network (ISDN)
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The feature requires the MSN service. (® 1.1.1.4 Multiple Subscriber Number (MSN) Ringing Service)
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COS programming determines the extensions that are able to use this feature.
PC Programming Manual References
4.8 [2-6-1] Numbering Plan—Main—Features—
4.11 [2-7-1] Class of Service—COS Settings—CO & SMDR—
Feature Guide References
1.3.1.2 Call Forwarding (FWD)
2.2.1 Class of Service (COS)
User Manual References
1.6.1 Forwarding Calls
242 Feature Guide
ISDN-FWD (MSN) Set / Cancel / Confirm
CF (MSN)