A method of automatically sharing and transferring information between a
Work at Work (WAW) ISDN telephone and a Work at Home (WAH) ISDN telephone.
This information includes, calling line identifier delivery from the WAW
telephone to the WAH telephone, facilitating subsequent transferring of
the call to the WAH telephone if desired. Message waiting status is also
shared, facilitating the coordination of message waiting lamps at both the
WAW and WAH telephone. Information from one telephone to the other is
carried transparently through the ISDN network as user-to-user
information, calling party subaddress, D channel X.25 packet message,
lower layer compatibility or a combination of these elements. The
telephones automatically establish ISDN calls between themselves and swap
information pertaining to the status of the companion telephones.
