Analog interface converters

Analog signalling interface converters

- converters for conversion of different analog interfaces
- signalling types:
* - E&M signnalling - several types
* - inductive signalling
* - IDTMF signaling (own Inoteska - extended DTMF dial)
* - LB - local battery - signalling with ringing
* - loop U signalling

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Off-premise extension

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