Address Context - Realm

Voice over LTE (VoLTE) is a technology for providing existing voice and SMS services over LTE which does not have a circuit-switched domain. It is implemented using IP Multimedia Subsystem (IMS), which is a standard 3GPP technology for IP-based multimedia services. One of the key requirements of the Roaming Architecture for Voice over LTE with Local Breakout (RAVEL) as described in 3GPP TS 23.228, 3GPP TS 24.229, and as proposed in 3GPP TR 23.850, is that the  Interconnection Border Control Function (IBCF) supports Optimal Media Routing (OMR) procedures and allows bypassing the Transition Gateways (TrGWs).

The 3GPP TS 29.079 describes the procedures for optimizing the media path for call within IP Multimedia Subsystem. The purpose of OMR is to identify and remove unnecessary media functions from the media path for each media stream associated with a session. The OMR procedures identify and name the IP address realm used for each media path segment among UAs and TrGWs. An IP realm name is associated with each set of IP endpoints that are mutually reachable through IP routing and without address translation. Endpoints in different IP realms usually require allocation of a TrGW between those IP realms for connectivity and possibly for NAT.

Prior to OMR procedures, the SBC supported direct media between endpoints residing in the same media zone. With the implementation of OMR procedures, the SBC is enhanced to perform media path optimization even when direct media is not possible between end points by allowing intermediate nodes to be bypassed for media anchoring. SBC supports OMR procedures in IBCF and P-CSCF roles.

To View Realm

On the SBC main screen, navigate to All > Address Context > Realm.

You can check the Realm for each Address Context or all the Address Contexts. Use the drop-down box to select the desired Address Context.

The Realm window is displayed.

To Edit Realm

Realm cannot be edited.

The Realm window is displayed. It is read only window.

To Create Realm

To create a new Realm, click New Realm tab on the Realm List panel.

The Create New Realm window is displayed.

The following fields are displayed:

Table 1: Realm Parameters

To Copy Realm

To copy any of the created Realm, click the radio button next to the specific Realm which you want to copy.

To copy a Realm, click Copy Realm tab on the Realm List panel.

The Copy Selected Realm window is displayed.

Make the required changes to the required fields and click Save. The copied Realm is displayed at the bottom of the original Realm in the Realm panel.

To Delete Realm

To delete any of the created Realm, click the radio button next to the specific Realm.

Click Delete at the end of the highlighted row. A delete confirmation message appears seeking your decision.

Click Yes to remove the specific Realm from the list.