[Phone] loop current is 62 mA

I'm having a problem with my phone line. Sometimes I experience severe audio distortion. I noticed that when the problem occurs, the loop current is around 62 mA. When things are working properly, the loop current is around 26 mA. I read on another forum that the loop current should be between 23 and 27 mA. Is that correct? Is this a problem I can fix, or is this a problem at the CO? If this is a Telus problem, what should a Telus tech do to fix it? ADSL seems to be unaffected.