13.6.4 Establishment of a new call, the original call is hold

23.2843GPPLocal Call Local Switch (LCLS)Release 17Stage 2TS

13.6.4.1 General Principle

The call hold procedures and call establishment procedures shall be applied with the following enhancements.

To avoid the local switching between remote parties of the new call and the held call, the new call shall have a different GCR than the GCR of the original call. During the new call establishment, the MSC server serving the UE which has the held call and has initiated the new call shall generate a new GCR for the new call.

The MSC server shall use the ASSIGNMENT REQUEST message to update the BSS serving the UE which has the held call and has initiated the new call with the new GCR and LCLS-Configuration for the new call.

The access bearer is kept unchanged.

13.6.4.2 Assignment Request

During the new call establishment, the MSC server serving the UE which has the held call and has initiated the new call shall send the Assignment Request message to update the BSS with the new GCR and LCLS-Configuration for the new call.

On receipt of Assignment Request, the BSS shall save the GCR and LCLS-Configuration in this message.