[VoiceOps] Mitel 3300 Issues

Mike Hammett voiceops at ics-il.net
Wed Mar 16 15:16:15 EDT 2022

We have tried on five of their ports. No dice so far. 

They did do a loopback from one of the ONS ports to an analog trunk port and that apparently worked. 

Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

From: "Brian Heinz" <brian.e.heinz at gmail.com> 
To: "Mike Hammett" <voiceops at ics-il.net> 
Cc: "voiceops" <voiceops at voiceops.org> 
Sent: Monday, March 14, 2022 6:11:15 PM 
Subject: Re: [VoiceOps] Mitel 3300 Issues 

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 < [ mailto:voiceops at ics-il.net | 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/ | http://www.ics-il.com ] 

Midwest Internet Exchange 
[ http://www.midwest-ix.com/ | http://www.midwest-ix.com ] 

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