[cisco-voip] Cracking noise during calls

[costas georgiou]

Hi guys,

 

I have an issue on one of my sites, where someone makes an outgoing call through the ISDN, they hear a crackling sound on the phone.  This is only happening to three phones out of 15.   The person on the other end cannot hear this, only the person who is making the call from the IP phone.  The provider apparently has checked the ISDN and all seems fine, the gateway has been completely replaced and also moved closer to the ISDN circuit.  We have swapped over a phone that we think did not have the issue, but it is still there.

 

Any ideas?

 

Thanks and Regards
 		 	   		  
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