Analysis:
1) network bandwidth for IPC need to be better than other smart devices;
2) there is a threshold for IPCs on how many phones can access to the video simultaneously, check it with the supplier;
3) Audio decoding capability of the phone is limited.
Instruction:
1) check the network bandwidth, it's suggested to use bandwidth > 2M (upstream or downstream), Loss Rate< 30%, Delay< 200ms;
2) check if the threshold is reached;
3) check the phone model, better to use a popular phone model to try.