What it does

The Rhino VoLTE TAS allows a subscriber to transfer an active call from their current active registered device (UE1) to another of their registered devices (UE2). This active call is maintained while the communication session between the A and B party’s devices has changed. Sessions can be transferred between devices that share the same IMS Public User Identity (IMPU). This service is supported for either originating or terminating users.

In the originating case, The A party subscriber can initiate a session transfer during an active session by pulling the call on to the UE2 device. For example, the calling party may transfer a call from a phone (UE1) to a tablet (UE2).

The Rhino VoLTE TAS verifies that the UE2 device is configured for a session transfer for the A party subscriber. If the configuration is verified, then the Rhino VoLTE TAS pulls the UE2 device into the call with the B party. Once the connection has been established, the UE1 device is disconnected from the session.

The service makes an SDP remote update on the existing called leg to guarantee SDP integrity and correctness on all involved dialogs.

The terminating case is also supported. This would be where the B party subscriber can use another registered device with the same IMPU to pull the call. The service makes an SDP remote update on the existing calling leg to ensure SDP integrity.

Interactions with other services


The charging vector of the call is updated due to the change in the transfer party’s new device on the session.


Currently, the declarative configuration for the session transfer to own device service is only available through low-level overrides, which require the guidance of Metaswitch support.

To configure the service, contact your Metaswitch customer care representative.

Note Full declarative configuration support for this service may become available in a later version.
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Rhino VoLTE TAS Version 4.0.0