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CME Dial tone crackles a bit then sounds good whenever phone goes off hook

Hi,

I got a compliant that whenever users take their phones off hook just before the dial tone sounds good they hear a bit of crackling on it.

I have asked the guys to checked to see that all debugs are off. Other than that calls are connected to 6 FXO ports and the call quality is fine no compliants on jitter or drop calls.

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What phone models and

What phone models and firmware versions?

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