2 ordering callback for an external number, 3 canceling a single callback – AASTRA DT690 User Manual

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2 ordering callback for an external number, 3 canceling a single callback | AASTRA DT690 User Manual | Page 47 / 140 2 ordering callback for an external number, 3 canceling a single callback | AASTRA DT690 User Manual | Page 47 / 140
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