Identify number called on handset

[stevef]

We have requirement for 6 registered external numbers on a 3CX box. All numbers get directed to ring groups that ring on all extensions. Using Linksys SPA942 handsets is there any way to identify the number called on the handset when it rings? The handset displays caller id by default, can it also display number callled in any way? The cient needs to answer the phone differently depending on the external number called.