Hello,
Could you please check the problem regarding. We can't call from Cisco desk phones (WCY) to Sony mobile phones. Today 05.17 pm (Thailand time) the user called from Cisco phone # 972 to my Sony mobile phone +66876057750. It ringing on the caller but, my Sony phones was not ringing and doesn't received the call. In a few days ago we also have this problem with number #922 can't call to +66875778894. And I'm rather sure the problem happen with Sony but for Nokia, Samsung and iPhone are OK.