Tools for Troubleshooting Your VoIP Service

We built these tools because our customers asked for them. Whether you're porting numbers, setting up a new location, or wondering why your calls aren't getting answered, these utilities give you real answers fast, no support ticket required.

Thinking about bringing your existing numbers over to Cannon VoIP? Before you submit a port request, it helps to know exactly what you're working with.

Our Number Lookup tool lets you paste in a single number or an entire list and instantly pull the carrier, caller name (CNAM), city and state, line type, OCN, and whether the number is portable, along with an estimated timeline for how long the port will take. Enter numbers in almost any format, as a range, or upload a .txt or .csv file for a large batch. Results export back out to .csv or .txt so you can share them with your team or keep them on file.

The tool runs up to 50 lookups per day, which is more than enough for most businesses evaluating a move to Cannon VoIP. One thing to keep in mind: port timelines shown are estimates, the losing carrier sets the final date, and that can shift. But knowing what to expect upfront makes the whole process a lot smoother.

Call quality problems almost always start at the network level. Before you roll out desk phones, softphone apps, or web-based calling at any location, run our VoIP Network Readiness checker from that exact location first.

The test checks your public IP, your ISP, and SIP connectivity, then produces a readiness score with a clear pass/fail breakdown for each component. It takes just a few minutes and can save you hours of troubleshooting down the road. It's also the first thing we recommend running when you're chasing down an existing call-quality issue, download the report and send it to your IT team or to Cannon VoIP support, and it gives us everything we need to diagnose the problem quickly.

Even if your calls are going out clean, there's a good chance you don't know what they carry when they leave your carrier: what level of trust they're assigned (STIR/SHAKEN attestation), how your caller ID actually arrives, whether you've been labelled "spam likely," or whether your equipment is really asking for HD audio. One call to our free test line answers all of it — no signup, no login, no cost.

What one call tells you

• The signature: attestation level (A, B or C, in plain terms), the verification result (the verstat value, so you know the number was validated against the signature rather than merely signed), and the origination ID — the identifier a carrier asks for first in a dispute.
• Caller identity: your caller ID exactly as it arrived, compared against the CNAM registered to the number — flagged when they differ, a common and otherwise invisible cause of calls displaying wrongly — plus whether the call was labelled "spam likely" against aggregated spam reporting.
• The number registry record: carrier and OCN, line type, rate centre and state, LATA and LRN, SPID, whether the number has ported before (with the date), whether it's portable now (with the reason when it isn't), and fast-port eligibility.
• Audio: whether a wideband codec such as Opus, G.722 or AMR-WB was offered — so you can confirm your equipment is actually asking for HD rather than assuming it — and the full codec list.
• The evidence underneath: the spoken readback kept word for word, the signalling presented as SIP with forwarded headers printed verbatim, and the raw call event.

It checks branded calling too

When your call carries a signed branded-calling token, the test line reads the branded name and logo out of it, fetches the logo image, and describes what's actually in the picture — so a broken, blank or out-of-date logo is obvious rather than looking like a logo that arrived correctly.

Private by design: results are only shown to somebody who can enter the number the call was placed from — no browsing, no listing, no directory — the number is submitted by form, never in the web address, and every result is deleted after four hours. Anyone can request an entry be removed.

Use this line any time you want to confirm your numbers are landing at full A attestation — after a port, after a configuration change, after setting up branded calling, or any time call answer rates start to dip unexpectedly.

Not sure your fax machine (or your eFax address) is actually working? There's a free test line for that too, no signup required.

Since that test page is public, avoid faxing anything sensitive to it, faxes shown there expire automatically after 4 hours, and you can request removal of any fax at any time. For everyday faxing (not just testing), see our eFax guide for how to send and receive faxes from email or the eFax portal.