Unrelated to us, chrismoos has just released what looks like a rather comprehensive implementation of the CDMA2000 1x cellular system as open source. From a SDR PHY through RAN to CN. It includes the signaling plane, circuit swithced calls, messaging (SMSC) and packet (IP) data.
See https://1xbts.org/ and https://github.com/chrismoos/1xbts for more infromation. #cdma2000 #retronetworking #cellular #sdr