Some of our users call in to a Staples conference call; however, when they try the PIN number is not recognized. I found that the VOIP tone is not recognized by all teleconference centers, so the dialed numbers are not being recognized. Is there a way around this that anybody knows of? We use Call Manager 5.1.2 and the majority of our phones are 7940 or 7960 using SCCP. Not sure what other info you might need, but I'll be happy to give what I can.