13.12 Explicit Call Transfer (ECT)
23.2843GPPLocal Call Local Switch (LCLS)Release 17Stage 2TS
In order to perform Explicit Call Transfer, if LCLS is established for the first call this will be broken when it is put on hold as per the procedures specified in clause 13.6. If LCLS is established for the second call then the local switching of the call shall be released in order to be connected to the held party.
Procedures to establish LCLS for the transferred call are not supported.