OsmocomDECT

There seems to be a bug in the sc1442x firmware causing sliding collision errors to be detected by the remote side. This is visible by continous handover attempts when making an incoming call in FP mode or the received Q1/Q2 bit settings when making an outgoing call in PP mode. Both the S-field and the Z-CRC appear to be fine however (according to the FritzBox DECT monitor). The reason for this is unknown so far, needs more debugging.