Mobile phone number receives incoming calls from Skype for Business after simultaneously ring feature is disabled


Symptoms

After you disable the simultaneously ring feature for a mobile phone number, you continue to receive incoming calls from the Skype for Business mobile client. This occurs regardless of whether the Skype for Business app is installed.

Cause

When you install the Skype for Business mobile app, you're prompted to provide your mobile telephone number before signing in. When you sign in to the Skype for Business client, a static registration with a unique endpoint ID is created on the Skype for Business front end server for that specific mobile device. If the Skype for Business mobile client was removed without first signing out, the static registration for this specific mobile device will become orphaned on the front end server.

Also, Skype for Business calls will continue to be forward to the mobile device's phone number and any phone number that you provided when you set up the Skype for Business mobile app. The forwarding will occur for a 15 day expiration timeout period from the last sign-in using the Skype for Business mobile app.

Workaround

If you have the Skype for Business app installed on the device

To resolve the problem, sign out of the Skype for Business mobile client on the specific mobile device. When you sign out of the Skype for Business app on a specific mobile device, the static registration for the mobile device is removed from the Skype for Business front end server. After the static registration is removed, Skype for Business calls will no longer be forwarded to the mobile device.

If you do not have the Skype for Business app installed on the device

To resolve the problem, re-install the Skype for Business app on your device and set it up for TTU Unified Communications. Then, sign out of the Skype for Business app.

NOTE: The 15 day expiration timeout period's call forwarding settings are independent from the settings for call forwarding in the Skype for Business desktop client. The settings cannot be disabled from anywhere other than the Skype for Business mobile client on the specific mobile device by signing out of the Skype for Business mobile client.

NOTE: Adding an additional phone number on a Skype for Business mobile client won't remove an orphaned static registration and therefore won't stop call forwarding to the mobile device. If you cannot sign out of the Skype for Business client on the specific mobile device that was used to create the current static registration, you have to wait the 15-day expiration timeout period before calls will stop being forwarded to the mobile phone number.