The Media System Configuration contains system-wide settings for the Media System, configuring the media system means setting the number of RTP/RTCP port pairs and the starting port. Other aspects of media handling, such as Media Profiles, Lists, and Media Crypto Profiles are handled in different sections of the UI and are explained on their own topic pages.
UDP ports are used for transmission of VoIP calls employing RTP protocols (RTP over UDP). The start port is the first port that can be used for a call. Calls require a pair of ports, one for the voice the other for the control information (RTP/RTCP). The number of port pairs determines the number of simultaneous IP Call Legs on the Sonus SBC 1000/2000. For example; if you have 100 pairs, you can have a maximum of 100 simultaneous IP Call Legs. This does not affect the number of TDM/TDM calls.
SBC Reserved Ports
If you have 100 pairs, and every call has one IP call leg, and one TDM call leg, then you can have 100 calls. However, if a call is IP on the inbound, and also IP on the outbound leg, then it requires two port pairs and this reduces the total number of simultaneous call accordingly (i.e., maximum of 50 IP/IP calls vs. Max 100 IP/TDM calls).
Configuring the Media System
- In the WebUI, click the Settings tab.
In the left navigation pane, go to Media > Media System Configuration.