Siemens Gigaset A580IP Manual page 57

Network services
Accepting a waiting call
Prerequisite: Call waiting is activated (
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§Menu§
You have the option of toggling or holding a conference call.
Please note
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If the first call was an internal call, the internal connection is ended.
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An internal, waiting call is shown on the display. You can neither accept the
internal call nor reject it.
Rejecting a waiting call
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The caller hears the busy tone.
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Accept Call Waiting
Reject Call Waiting
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Page 54).