Frame loss can be due to a number of issues such as network congestion or errors during transmissions.
An independent performance test showed that performance was unstable with network congestion.
These situations result in network congestion that is mainly driven by a small number of heavy users.
The writer thought the poor call quality was just "network congestion."
I don't like restrictions, but network congestion is here.
Shall we get to the topic at hand, network congestion?
This is not to say that it no longer has an impact on network congestion.
Onto this is added a more variable level of delay due to network congestion.
A more likely scenario is network congestion within a switch.
When more people try to call at the same time, the increased calling volume may create network congestion.