8 Interaction with other supplementary services

22.0673GPPenhanced Multi Level Precedence and Pre-emption service (eMLPP)Stage 1TS

8.1 Calling Line Identification Presentation (CLIP)

No interaction.

8.2 Calling Line Identification Restriction (CLIR)

No interaction.

8.3 Connected Line Identification Presentation (COLP)

No interaction.

8.4 Connected Line Identification Restriction (COLR)

No interaction.

8.5 Call Forwarding Unconditional (CFU)

The CFU service takes precedence over the eMLPP service. The precedence level of calls shall be preserved during the forwarding process.

No interaction except for voice broadcast and voice group calls (see the respective stage 1 descriptions 3GPP TS 42.069 [6] and -3GPP TS42.068 [5]).

8.6 Call Forwarding on mobile subscriber busy (CFB)

An incoming call with higher priority level shall override CFB in case of CW (see item f of clause 4).

If the mobile station does not pre‑empt the on‑going call of lower priority and the user rejects the CW, the call may be forwarded to another party if CFB applies.

8.7 Call Forwarding on No Reply (CFNRy)

If a mobile station does not automatically accept an incoming call while being idle and the user does not accept the call, the call may be forwarded to another party if CFNRy applies.

8.8 Call Forwarding on mobile subscriber Not Reachable (CFNRc)

No interaction.

8.9 Call Waiting (CW)

Pre‑emption of on‑going point‑to‑point calls to accept incoming calls of higher priority is only possible if the subscriber has a CW subscription.

The CW indication to the mobile station shall imply the precedence level in order to enable the mobile station to decide on automatic accepting of the waiting call.

8.10 Call Hold

A held call may be pre‑empted due to lack of network resources. The call is cleared and the pre‑empted user shall receive an appropriate indication.

8.11 Multi‑party Service (MPTY)

eMLPP shall apply to the different call legs of a MPTY as for other calls.

8.12 Closed User Group (CUG)

No interaction. eMLPP shall not override CUG restrictions, except high priority calls shall override CUG restrictions as a network option.

8.13 Advice of Charge (AoC)

No interactions.

NOTE: Different charge metres for different priorities can be obtained e.g. by variation of the e1 or e2 parameters of the charge advice information according to 3GPP TS 22.024.

8.14 Barring of Outgoing Calls (BAOC)

High priority calls shall override BAOC as a network option.

8.15 Barring of Outgoing International Calls (BOIC)

High priority calls shall override BOIC as a network option.

8.16 Barring of Outgoing International Calls except those to the Home PLMN country (BOIC‑exHC)

High priority calls shall override BOIC‑exHC as a network option.

8.17 Barring of All Incoming Calls (BAIC)

An incoming high priority call shall override BAIC as a network option.

8.18 Barring of Incoming Calls when Roaming outside the home PLMN country (BIC‑Roam)

See subclause 8.17.

8.19 Call Transfer (ECT)

For a normal call transfer, the precedence level of calls is preserved during the transfer process.