That’s a broad view of results from the Interop Labs test of VoIP gear run on the Interop Las Vegas show’s test network and presented at the Labs’ Interop exhibit.

Volunteers set up five model enterprise networks fitted with VoIP equipment, network firewalls, application firewalls, wi-fi access points and VPNs, and ran VoIP calls through them, using a variety of VoIP phones — softphones, hard phones, wi-fi handsets and PDAs.

The tests involved equipment from two dozen vendors. The calls ran over a combination of the public phone network and the internet, using a service provider that supports SIP signalling, and then testers tried to disrupt the calls and measure the results.

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