13 Call Clearing

29.0073GPPGeneral requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)Release 17TS

When a call is to be cleared, the MSC/IWF shall handle both the links, towards the UE as well as towards the fixed network.

At the link towards the UE out-band (3GPP TS 24.008) signalling shall be used. Changes in the in-band status bits shall not be used to signal call clearing.

At the link towards the fixed network, the clearing procedures appropriate to the fixed network shall be used, together with any additional procedures described in the ITU‑T Recommendation applicable to the type of interworking (V.110, V.120, PIAFS or V-series modem).