Linear: The base station will distribute the call in predefined order from the lowest-numbered available
handset, if no answer within ring timeout, the call will be sent to next available handset in sequence.
This mode is also called “serial hunting”.
In the example below; all handsets are available, the incoming call will be sent to HS1 since it’s the
lowest-numbered available handset, if no answer within ring timeout, the call will be sent to HS2 since
it’s the next available lowest-numbered handset, and same applies for HS3 and etc.