Update calling-chat.md

Author: tomkau

articles/communication-services/concepts/interop/calling-chat.md

@@ -54,7 +54,7 @@ const call = callAgent.startCall([teamsCallee]);
 - Advanced call routing capabilities such as call forwarding, group call pickup, simulring, and voice mail are not supported.
 - Teams users can't set Communication Services users as forwarding/transfer targets.
 - There are a number of features in the Teams client that do not work as expected during 1:1 calls with Communication Services users.
-- Third party [devices for Teams](/MicrosoftTeams/devices/teams-ip-phones) are not supported.
+- Third party [devices for Teams](/MicrosoftTeams/devices/teams-ip-phones) and [Skype IP phones](/skypeforbusiness/certification/devices-ip-phones) are not supported.
 
 ## Chat
 With the Chat SDK, Communication Services users or endpoints can start 1:n chat with Teams users, identified by their Azure Active Directory (AAD) object ID. You can easily modify an existing application that creates chats with other Communication Services users, to instead create chats with Teams users: