Yep, happens on Legends commonly. Lucent / Avaya solution is to have T-1 supplier install "echo cancellers" (yes, really). These do actually exist. There's not much to do on the Legend / Magix side, but the Telco could help if they wanted. FYI: on a Definity there is echo cancelling software, but, (know this sounds hard to believe) it's a paid-for extra.