I logged two calls that had problems today:

Call Reference ID: CXC-177-6595f7f0-a9d5ed0-13c4-4c547ae2-3e6fd247-50270900@208.94.157.10 - this call rang but no audio when answered

Call Reference ID: 72709d69b7abc98b@24.180.168.134 - this call was connected normally and dropped after about 2 minutes.

Thanks for any advice.