[VoiceOps] Mitel 3300 Issues

[Brian Heinz]

I work for a Mitel partner and have worked with 3300's since 2004. Assuming
this is the embedded analog board on the controller, the ring detect
threshold per the Mitel hardware documentation is 20-30Vrms, depending on
the frequency of the ringing signal coming in.

That being said, it's entirely possible the port on the board has gone
bad, I've seen it myself. Is there an unused port on the board you can
connect to?

On Mon, Mar 14, 2022 at 3:58 PM Mike Hammett <voiceops at ics-il.net> wrote:

> A customer of mine has a Mitel 3300 PBX. We deliver to them analog lines.
>
>
> Everything worked fine for months, if not years. Then one day they say
> they can't receive inbound calls. They can still place outbound calls.
>
> They're on a Grandstream HT818 ATA. I move some lines to the Zhone ONT
> that's on-site. No improvement.
>
> I plug in a normal analog handset from Walmart or Menards. They all ring
> and answer just fine.
>
> I plugged in a patch cable from their Mitel ONS2 to the analog trunk 5 and
> they set up an extension on that ONS2 so that a call to it would trigger an
> inbound call on their analog line. Apparently that worked.
>
> The Mitel support agent is saying that we're not sending them between 24v
> - 48v.
>
> All cables are 6' at most.
>
> A) I don't see anywhere to configure voltage on either platform.
> B) I don't know how it could work and then just stop, other than equipment
> failure.
> C) I don't know how it would work just fine on a COTS phone, but not their
> Mitel.
> D) I don't know how the same problem could also afflict another ATA (build
> into the ONT).
>
>
> Any tips?
>
>
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
>
>
> Midwest Internet Exchange
> http://www.midwest-ix.com
>
>
>
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