4 parallel ringing, 1 disabling parallel ringing temporarily, 2 restoring parallel ringing – AASTRA DT690 User Manual

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4 parallel ringing, 1 disabling parallel ringing temporarily, 2 restoring parallel ringing | AASTRA DT690 User Manual | Page 41 / 140 4 parallel ringing, 1 disabling parallel ringing temporarily, 2 restoring parallel ringing | AASTRA DT690 User Manual | Page 41 / 140
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