OpenR2 is a library that implements the MFC/R2 and DTMF/R2 telephony signaling protocols over E1 lines. Along with the library, branches and patches for Asterisk and FreeSWITCH are provided with MFC/R2 support in chan_zap / chan_dahdi and OpenZAP. Starting with Asterisk 1.6.2 is used by Asterisk to give official MFC-R2 support to chan_dahdi.
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