eZ32 and polarity reversal

[tincho.rn]

Hi. Does somebody knows if it is possible to generate polarity reversal so as to indicate to a analog extension that a communication starts and/or ends?. And other question related to this, is it possible to generate a 16KHz tone to indicate a analog extension the same sing (end or beganing of a communication)?. Thanks in advance. Regards.

[vad]

No