10.2.4 IP Realm Indication

29.1623GPPInterworking between the IM CN subsystem and IP networksRelease 17TS

Whenever requesting a new IP media-path (i.e. creation of IP bearer terminations), the TrGW may indicate the correspondent IP realm/domain to the TrGW. The TrGW shall assign the IP termination in the IP realm indicated. The same IP realm shall be applied to all media streams associated with the termination. The IP realm identifier shall not be changed after the initial assignment.

A default IP realm may be configured such that if the TrGW has not received the IP realm identifier and the TrGW supports multiple IP realms then the default IP realm shall be used.