Really bad sound quality, so bad that most people complain and ask me to call back.

Also, I can't dial normal extensions, sometimes I can change a codec to PCMA or something like that on the list and then it helps but then it seems that this particular function has nothing to do with being able to dial extensions. I spent a half hour trying to call my medical clinic this morning.

Also the customer service bites. John Seehy seems to be the only English speaking guy because someone else mentions him in the comments.

What a waste of money! Too bad because its a nice design but it really doesnt work well. Who can have an SIP/VOIP phone that doesn't allow you to dial extensions????