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nec sl2100 internal phones have random incoming call but only noise

nec sl2100 internal phones have random incoming call but only noise

nec sl2100 internal phones have random incoming call but only noise

Hi Guys,

NEC sl2100, many phones have a weird random incoming call but only noises when pick up the call.
It started to be happening this week, no problem before for a year.

1. Random phone ringing, ringing sound as internal phone
2. after pick up the call, there are only noises. Listening closely to noise, it sounds like a busy call but with a lot of noises.
3. I'm sure that we didn't do any updates on it.
4. Already reboot the machine, but still happening
5. I did call testing to our phone external lines, all lines are working.

Did this happen to anyone before?


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