Cracking sound on Inbound calls

Hi everyone,

Does anybody have an idea the reason behind cracking sound on inbound calls?

Got a query from a client that they are hearing a cracking sound during the call when people are ringing in. These cracking sound can be heard on 4 handsets.

The client's PBX is hosted in a cloud.

Can somebody shed some light here on this cracking sound issue?

Your help is very much appreciated.




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