Troubleshooting video chat dropouts

["Noam Birnbaum" <noam () maccentricsolutions com>]

Hi everybody,

One of our clients has been complaining that video chats can be extremely choppy, or drop out entirely and require 
restarting the chat, on Skype and Google Hangouts. It seems to be intermittent, and my first suspicion was simply that 
the problem resides with the remote correspondents' network. 

However, there have been a number of instances when the remote correspondent was unlikely to be the problem, such as 
when a chat with a remote correspondent works fine offsite, repeatedly, but not at the office, repeatedly.  There are 
other such scenarios, like when the remote correspondent has never experienced these problems except when chatting with 
our client.

We've done the following:

- set videoconferencing to IP Precedence 7 on the client router (Meraki MX60)
- bound video to the less-utilized secondary WAN line

However, rather than waiting to see (again) whether this actually fixes it, I would love to get to the bottom of the 
problem at the packet level. I am considering running a ring buffer capture for all videoconferencing traffic. I would 
want to compare videochats that don't exhibit dropouts to those that do. 

Questions:

1. How would you set up the ring buffer capture to filter Skype and Google Hangout chats?  

2. What metrics and methods of comparison would you use to try to isolate the problem in the troublesome captures?

Many thanks!

noam

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