If you use Skype Connect and calls to one or more Skype Numbers assigned to a SIP Profile are not working, it may be that the Skype Numbers are expiring without being renewed by the administrator. Skype Numbers are created with an expiry date and cannot be automatically extended.
To check whether the Skype Numbers affected are expiring:
As Skype Numbers cannot be automatically extended, you must remember to actively renew them within Skype Manager.
Need more help with Skype Connect? Check out the Skype Connect troubleshooting section.