22.0913GPPExplicit Call Transfer (ECT) supplementary serviceStage 1TS
The NOTE describing the Call Hold scenario is not included in the 3GPP stage 1 specifications.
In 3GPP specifications there a explicit explanation that the previously held party shall be informed of the retrieve procedure.
NA1: there is no explicit description of this procedure.
In 3GPP specifications there is no explicit exchange of the subaddress of the remote parties after the successful transfer defined.
NA1 states: After the successful transfer of the call, the subscriber B and subscriber C can deliver if supplied their subaddress to the other subscriber.