AN93
204 Rev. 0.9
Examples of Line Impairments
DTMF Distorted by Low Line Level
Figure 71. Defective DTMF
Figure 72. Normal DTMF
Solutions:
Fix phone line.
Lower DTMF level with AT:U46, 0BD0 or AT:U46, 0CF0
Check the line current level with AT:R79 and AT:R6C.
