Aastra DT690 User Manual page 116

DT690
conjunction with a personal group. However, the GSM mobile telephone will
still retain its regular number.
Note: The Mobile Extension service is also totally applicable to your
108
residential extension connected to the public ISDN network. Whenever
necessary, contact your system administrator for more information
concerning the availability of this specific service for your telephone
facility.
1424-EN/LZT 103 090 Uen A1 2008-10-24