Call Hold and Transfer Music on Hold
The following diagram begins with the condition that IP PBX A is already connected with a gateway, with the Oracle® Enterprise Session Border Controller and the softswitch positioned between the two.
You can see in the call flow where the channels for transporting media are closed, and where the RTP/RTCP is stopped. This creates a pause for the call. With the Oracle® Enterprise Session Border Controller mediating the process, IP PBX A and the softswitch exchange TCS and OLC messages that allow music on hold (MHO) to flow between IP PBX A and the gateway.
![](img/GUID-82DCCBD2-D598-4E7E-A1BA-067CC7DE2C1E-default.jpg)