Configuring the Realm
You need to set the each realm config element’s msm release field to enabled for all the realms for which you want to use SIP DMR.
Although the mm in network field is not specific to the SIP distributed media release feature, it can be used to release the media back to a connected network that has multiple realms. This field does not need to be configured in order for the SIP distributed media release feature to work. However, if this field is set to enabled and the ingress and egress realms are part of the same network interface, it lets the Oracle® Enterprise Session Border Controller release the media.