sundance-communications.com/forum Forums TDM Business Telephone Systems Mitel Telephones & Systems SX200 ICP CX

I have a new install of a 200 ICP CX 4 lines 10 Stations. Customer is complaining of noise/scratchy line quality. Local Telco has been out twice, and they are fine. Any suggestions before change out the system.

Step 1:

Check your ground. Should have a good ground to telco ground and hopefully also to a ground rod. Should have less than 1 volt between case and any ground location.

Step 2:

Verify the noise. Is it on the lines ahead of the PBX? Is it on a particular phone? Is it on all lines? Hear it for yourself. Don't call them liars, but NEVER, EVER, take the customer's word for jack.

Step 3:

Check your DSP resources. Typically DSP resource shortages will result in low volume or low volume on EMEM recordings.

My money is on CO line problem ahead of the PBX (Never take the telco's word for anything, either). Outside chance: the one customer who is complaining has a bad handset or handset cord.

I assume these are loop start trunks not ground start as the CX only supports LS? If so, with the CX it's recommended that you run the "LINE QUALITY TEST" for LS trunks before putting them in service.
Give it a try, I've experienced this before also.

or try the "LS MEASUREMENT TOOL"

I haven't used the "Line Quality Test" but I understand that it will recommend the loop length setting.