User's Manual 9. Configuring VoIP Parameters
Version 4.4.0 123 MP26x/MP27x
9.9 Enabling Polarity Reversal
The procedure below describes how to enable polarity reversal. When this feature is
enabled, the analog port (FXS) interface polarity is reversed to indicate the start of a VoIP
session, and is reversed back when the VoIP session ends.
To enable polarity reversal:
1. In the 'Voice Over IP' screen, click the Telephone Interface tab; the following screen
appears:
Figure 9-23: Telephone Interface Tab Screen
2. Select the 'Enabled' check box to enable the Polarity Reversal feature.
3. Click OK to apply your settings.
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