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Making External Calls

This function is used to make an external call.
1 Lift the handset and check if a calling tone is
heard.
- Or, press the [Speaker] button to check if a calling
tone is heard.
2 Press the [9] button, a C.O. line group number,
and press the target number.
3 Press the [Send] button. Then, a ring back tone
is heard.
4 Start conversation when the recipient answers.