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The Panasonic TGP550 and additional cordless handsets (TPA50) can
be assigned to a single HPBX user or multiple HPBX users. By default,
the TGP550 and associated cordless handsets will be assigned to a
single user; all the handsets will ring when an incoming call goes to
the user’s extension:
Alternatively, you can assign a single user to each handset:
primus.ca
Customer Configuration:
Panasonic TGP550/TPA50
Handset User Assignment Guide