Problem: Shortel 115 IP telephone could make calls internally to phones in the building but when you would try to place a call to an outside number, you would immediately get an alternating tone. Similar to a busy signal but two distinct tones alternately repeating.
Solution: Within Shoreware Director, I went into the individual user settings and saw that the Primary Phone Port was set to “Any IP Phone.” I then set it to the MAC address to the phone in question and saved. All was good after that.