For users using the PCPhoneline.com FXS to FXO port converter with a Sipura ATA who experience DTMF detection problems from the PSTN, there is an input gain field located in the administration area of the Sipura ATA that may be adjusted to address this problem. The input gain field is often defaulted on the Sipura ATA to a negative value causing several decibels of volume loss such that the Sipura ATA cannot detect the incoming DTMF touchtones dialed remotely. To resolve the problem you should increase the value of the input gain field one step at a time and retest until the problem is resolved.
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