I have setup a few Asterisk systems for customers using Digium TDM400 cards and Aastra phones. No problems with sound quality at all except at this one site.<br><br>Every time I try their system I don't hear any problems but they tell me that it is really bad. They describe it a a loud scratching sound. <br>
<br>Are there any tests that can be done to pinpoint the problem? Has anyone seen this before? Are there known causes for this?<br clear="all"><br>-- <br>Open Source: To innovate then create<br>Proprietary: To imitate then litigate