Similar to the traffic heard on 6905 kHz LSB this morning. 6900 kHz LSB / 6900 kHz USB seems to be a "calling" frequency of sorts. Due to heavy static crashes I'm giving this a SIO 211. Sounds like more than two stations chatting away (the stations on 6905 LSB possibly QSYed from 6900 LSB...this is the behavior I've noticed in the past).