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  1. PongThai

    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...

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