14.12. SIP URI Dialing 
For internal video calls with OpenScape 4000, OpenScape SBC and OpenScape UC, there
are currently two possibilities:
- Video calls between OpenScape 4000/ OpenScape UC endpoints;
- Video conferences held by OpenScape UC conference bridge for OpenScape 4000/ OpenScape UC endpoints.
For video calls and video conferences with other companies, OpenScape 4000 supports
the following two use cases:
- Video dial out: OpenScape UC clients type in a SIP URI string and join video conferences from other companies (routed through internet).
- Video dial in: users from other companies type in a SIP URI string and join the video OpenScape UC conference as unknown users.
The functionality is achieved with the following video components:
- Call Control: OpenScape 4000
- Video gateway: OpenScape SBC
- Video MCU: video conference server
- Video Clients: OS UC Clients: Fusion, WebRTC client
- Video Room Systems from Poly: e.g Group series, Group 7500