Consider the following scenario:
- You implement a third-party SIP-Trunk integration solution such as Cisco, Avaya Aura and so on, with Microsoft Skype for Business Server 2015.
- You are an enterprise voice (EV) enabled Skype for Business user. User B and User C are using the Cisco or Avaya phone.
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User C has a call forwarding to User B.
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You make a telephone call with User C by using the Skype for Business client.
- The call connection is established between you and User B.
In this scenario, you may see the Skype for Business client displays the User C's caller ID (also known as a Calling Line ID) instead of User B's caller ID.