SocketException: Only one usage of each socket address (protocol/network address/port) is normally permitted

[Atrejoe]

View details in Rollbar: https://rollbar.com/SPACallmanagerPro/SPA-Callmanager-Pro/items/37/

Traceback (most recent call last):
  File "System.Net.Sockets.Socket", line 140, in DoBind(System.Net.EndPoint endPointSnapshot, System.Net.SocketAddress socketAddress)
  File "System.Net.Sockets.Socket", line 150, in Bind(System.Net.EndPoint localEP)
  File "System.Net.Sockets.UdpClient", line 120, in .ctor(System.Int32 port, System.Net.Sockets.AddressFamily family)
  File "System.Net.Sockets.UdpClient", line unknown, in .ctor(System.Int32 port)
  File "D:\Dropbox\VB\Projects\SPA-Call-Manager-Pro-master\Cisco\ClsPhone.vb", line 155, in Startlistening
SocketException: Only one usage of each socket address (protocol/network address/port) is normally permitted