I'm having a problem with conferencing remote IP phones. I have an 8-port card with 2 modules on it and 3 extensions programmed. The customer is complaining that the audio is real choppy and distorted when they conference these extensions. I tested last week with 2 of the three and all worked fine. Today I went back and sure enough it did not work. As I was calling each individual extension the audio was clear but once I conferenced all of them together it was impossible to carry on a conversation. Could this be a problem with the IP card? Or would it be a problem somewhere else?