The Wireless Internal to Server calls, are calls from clients which are connecting via wireless to a server. If the Wired Internal to Server calls scenario does not display any issues, but your organization has Wireless Internal to Server issues, then it can be concluded, that the variables are factors associated with placing calls over wireless network. The Wireless External to Server is similar to the Wired External to Server scenario, however the clients used to make the calls use wireless connectivity when external.