# Bandwidth control of video links

The video stream of video links is handled individually by the bandwidth control.

A video call requires additional bandwidth for video data transmission (video stream), but no additional DSP resources, since video stream is not implemented via the communication server. The bandwidth requirement for video in the bandwidth model is considered as 2nd priority in the calculation: If enough bandwidth is not available for video stream, the connection is set up without video.

To prevent a WAN link from being blocked by a video call, you can reserve a minimum bandwidth requirement for audio stream. The minimum requirement must be such that the required number of simultaneous connections can be set up as audio connections.

Figure 1. Handling the video stream in bandwidth control

Table 1. Legend and explanations
| Available bandwidth |  | Video stream of a call
| Reserved bandwidth for audio (Parameter Reserved bandwidth for audio view) |  | This connection or connection part can be set up.
| Audio stream of a call |  | This connection or connection part cannot be set up.
A | One audio connection is set up, two others are added.
B | One video connection is set up, a second audio connection is added, a third audio connection can no longer be set up.
C | One audio connection is set up, another one is added. The third call is a video call. Due to lack of space, this is only set up as audio connection.
D | A video call is set up as audio connection since the bandwidth required for video stream is larger than the available bandwidth. A further audio call can be set up.

Parent topic: Multi site
↑