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Phone Line Noise (NEC SL1000) PABX

Hi guys. I got some noise on My PABX system and can't figure out what is causing the problem.

I got 4 CO Line & 22 Extension Line In NEC PBX SL1000 right now. Problem is Only Income/Outgoing call from CO lines are having noise and extension lines are fine.

Things I alrdy check and confirm are below :
- All CO Line are clear before entering PABX
- I had Alrdy switch CO port from original blade 1 to blade 2.

Please help me guys.

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