This was sent to me a long long time ago. It might be what you were thinking?
---
[tt]Simple VOIP Network Test using a Ping Command
Instructions
[tt] * 1. Select Start > Run.
* 2. Type cmd, click OK.
* 3. At the prompt, type:
ping -t -l160 -w250 192.168.0.100
(VoIP Processor/Blade IP address, such as 192.168.0.100) and press Enter.[/tt]
This starts the ping program and sends packets to the VoIP device address (or other test device).
-l160 makes the packets the same size as a 20msec. voice packet.
-w250 says if there is no response in 250 msec., the packet is dropped.
Any real-time application such as voice require no more than 250msec response time (I actually prefer no more than 200msec)
Periodically you can press CTRL + BREAK keys and see the packet loss statistics. Packet loss ratios of 1% or less can be considered acceptable.
This tool provides quantitative results that can be used when trying to engineer the network.[/tt]
~~
Gene at
www.GHTROUT.com