There are three call WAiting types:
• to continue the conversation without receiving the new call
• to accept the second call, interrupting the ongoing conversation
• to talk to the two callers in sequence

to continue the conversation without receiving the new call
After the second ring tone of the second call
for key telephones: press shortly the "Flash" button, then dial 0
for rotary dial telephones: press shortly the turn off lever/bar and dial 0
In the event the person making the second call hears a signal, showing that the line is busy.
to accept the second call, interrupting the ongoing conversation
After the second ring tone of the second call
for key telephones: press shortly the "Flash" button, then dial 1
for rotary dial telephones: press shortly the turn off lever/bar and dial 1
In the event the second call is connected, and the previous conversation is interrupted.
To talk to the two callers in sequence
After the second ring tone of the second call
for key telephones: press shortly the "Flash" button, then dial 2
for rotary dial telephones: press shortly the turn off lever/bar and dial 0
To pass from one caller to the other, please press the "Flash" button and dial 2.
In the event of finishing the conversation with one of the subscribers, please press the "Flash" button, then press 1 and continue talking with both subscribers.