Exceed Technologysupport
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Connection test

Measures what your calls will experience from this network. Nothing to install, no sign-in; about two minutes. Keep the page in the foreground while it runs.

Latency, jitter and loss
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Round trip to the support server. Voice wants under 150 ms, jitter under 20 ms, loss under 0.5%.
Download
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Each call needs about 100 kbps; this shows the headroom around it.
Upload
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Upload is what carries your voice out. It is usually the tighter side.
Firewall and NAT
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Checks that UDP can leave your network and how the firewall presents you to the outside. More than one public address points at load-balancing or symmetric NAT, which phones dislike.
Phone platform
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From our side: latency to the platform and a live registration of a test extension. Confirms the platform itself is healthy right now.

Who is this test for?

The result is sent to Exceed support automatically so a technician can follow up if anything needs attention.

SIP ALG ("SIP helper", "SIP transformations") is a firewall feature that rewrites phone traffic and is the most common cause of one-way audio and phones dropping registration. The check above proves whether it's on.