I have a customer with 7.1 expanded software and a PRI. Their system test log has been filled to 50 with the following error codes: 310-370175 and 310-3C00759E and one occurance of 310-36004DDD on 11/7 and again today, and one occurance on 11/7 of 310-3C0003E4. They have started experiencing an occasional problem that when someone calls the main number the call is not being answered by the AA but by random voicemail boxes. I'm not sure if the 310 error codes and the voicemail issue is related. This morning they called me and said that now random phones are ringing but there is no incoming call. I have been tracking the error codes for about a week and the only ones are always the 310 and as soon as I clear the log it starts again. Is the problem in the system or from the carrier?