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* In multiline phones, several extension numbers can ring on the phone.

* LACC uses the following models:
     Cisco, model 7910 (1 line).
     Cisco, model 7912 (1 line).
     Cisco, model 7940 (2 lines).
     Cisco, model 7960 (6 lines).

Multiline phones have one button for each line.
Single line phones do not have any line button.