I was just about to update this, the line seems fine with an analog set.
The model is a Rath microtech smartphone 2. On their web-page this is listed as a common issue, so I emailed their tech support to see if they had any suggestions. I'll post what I find out.
I have a handful of others...
Hello,
I have a few analog elevator phones attached to Audio Codes VOIP gateways, which are running to a Mitel 3300 controller. When I initiate a call on the elevator phone, it rings our front desk, they pick up and maybe get a second of speech in, then the call disconnects.
Here is an output...
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