Using dual-tone multifrequency signalling, Using dual-tone multifrequency sig- nalling – Siemens 3000 User Manual

Page 52

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Using dual-tone multifrequency signalling, Using dual-tone multifrequency sig- nalling | Siemens 3000 User Manual | Page 52 / 104 Using dual-tone multifrequency signalling, Using dual-tone multifrequency sig- nalling | Siemens 3000 User Manual | Page 52 / 104
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