I have a cisco SPA303 phone that I have registered with 3cx both lines GREEN and show up as registered in the 3CX extension list. However when I go to make a call the phone gets a FAST busy and says DECLINE. I ran wireshark and it is saying SIP STATUS 603 DECLINE . This is most likely some kind of easy fix but. I cant seem to locate that setting that is causing this. Thanks in advance for any help.