diff --git a/33128/r18/TS33128Payloads.asn b/33128/r18/TS33128Payloads.asn
index a2c031b955807e5edc02f5f5309babcc79c4aa4b..e093a819a682ba5e944c9afb0bb65c97237de839 100644
--- a/33128/r18/TS33128Payloads.asn
+++ b/33128/r18/TS33128Payloads.asn
@@ -1770,7 +1770,8 @@ AMFRegistration ::= SEQUENCE
     fiveGSUpdateType                [28] FiveGSUpdateType OPTIONAL,
     uEAreaIndication                [29] UEAreaIndication OPTIONAL,
     establishmentCauseNon3GPPAccess [30] EstablishmentCauseNon3GPPAccess OPTIONAL,
-    additionalUserIdentifiers       [31] UserIdentifiers OPTIONAL
+    additionalUserIdentifiers       [31] UserIdentifiers OPTIONAL,
+    alternativeNSSAI                [32] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.2.2.3 for details of this structure
@@ -1844,7 +1845,8 @@ AMFUnsuccessfulProcedure ::= SEQUENCE
     gPSI                        [7] GPSI OPTIONAL,
     gUTI                        [8] FiveGGUTI OPTIONAL,
     location                    [9] Location OPTIONAL,
-    additionalUserIdentifiers   [10] UserIdentifiers OPTIONAL
+    additionalUserIdentifiers   [10] UserIdentifiers OPTIONAL,
+    alternativeNSSAI            [11] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.2.2.8 on for details of this structure
@@ -1897,7 +1899,8 @@ AMFUEConfigurationUpdate ::= SEQUENCE
     slice               [5] Slice OPTIONAL,
     serviceAreaList     [6] ServiceAreaList OPTIONAL,
     registrationResult  [7] AMFRegistrationResult OPTIONAL,
-    sMSOverNASIndicator [8] SMSOverNASIndicator OPTIONAL
+    sMSOverNASIndicator [8] SMSOverNASIndicator OPTIONAL,
+    alternativeNSSAI    [9] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.2.2.10.2 for details of this structure
@@ -2309,7 +2312,8 @@ SMFPDUSessionEstablishment ::= SEQUENCE
     pCCRules                      [26] PCCRuleSet OPTIONAL,
     ePSPDNConnectionEstablishment [27] EPSPDNConnectionEstablishment OPTIONAL,
     satelliteBackhaulCategory     [28] SBIType OPTIONAL,
-    gEOSatelliteID                [29] GEOSatelliteID OPTIONAL
+    gEOSatelliteID                [29] GEOSatelliteID OPTIONAL,
+    alternativeNSSAI              [30] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.3 for details of this structure
@@ -2336,7 +2340,9 @@ SMFPDUSessionModification ::= SEQUENCE
     uPPathChange                [19] UPPathChange OPTIONAL,
     pFDDataForApp               [20] PFDDataForApp OPTIONAL,
     satelliteBackhaulCategory   [21] SBIType OPTIONAL,
-    gEOSatelliteID              [22] GEOSatelliteID OPTIONAL
+    gEOSatelliteID              [22] GEOSatelliteID OPTIONAL,
+    -- Tag [23] is not used in this version of the specification
+    alternativeNSSAI            [24] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.4 for details of this structure
@@ -2356,7 +2362,8 @@ SMFPDUSessionRelease ::= SEQUENCE
     nGAPCause                   [12] NGAPCauseInt OPTIONAL,
     fiveGMMCause                [13] FiveGMMCause OPTIONAL,
     pCCRuleIDs                  [14] PCCRuleIDSet OPTIONAL,
-    ePSPDNConnectionRelease     [15] EPSPDNConnectionRelease OPTIONAL
+    ePSPDNConnectionRelease     [15] EPSPDNConnectionRelease OPTIONAL,
+    alternativeNSSAI            [16] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.5 for details of this structure
@@ -2414,7 +2421,8 @@ SMFUnsuccessfulProcedure ::= SEQUENCE
     rATType                     [17] RATType OPTIONAL,
     sMPDUDNRequest              [18] SMPDUDNRequest OPTIONAL,
     location                    [19] Location OPTIONAL,
-    ePSPDNUnsuccessfulProcedure [20] EPSPDNUnsuccessfulProcedure OPTIONAL
+    ePSPDNUnsuccessfulProcedure [20] EPSPDNUnsuccessfulProcedure OPTIONAL,
+    alternativeNSSAI            [21] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.8 for details of this structure
@@ -2437,7 +2445,8 @@ SMFPDUtoMAPDUSessionModification ::= SEQUENCE
     servingNetwork               [15] SMFServingNetwork OPTIONAL,
     handoverState                [16] HandoverState OPTIONAL,
     gTPTunnelInfo                [17] GTPTunnelInfo OPTIONAL,
-    ePSPDNConnectionModification [18] EPSPDNConnectionModification OPTIONAL
+    ePSPDNConnectionModification [18] EPSPDNConnectionModification OPTIONAL,
+    alternativeNSSAI             [19] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.7.1 for details of this structure
@@ -2469,7 +2478,8 @@ SMFMAPDUSessionEstablishment ::= SEQUENCE
     selectedDNN                   [24] DNN OPTIONAL,
     handoverState                 [25] HandoverState OPTIONAL,
     pCCRules                      [26] PCCRuleSet OPTIONAL,
-    ePSPDNConnectionEstablishment [27] EPSPDNConnectionEstablishment OPTIONAL
+    ePSPDNConnectionEstablishment [27] EPSPDNConnectionEstablishment OPTIONAL,
+    alternativeNSSAI              [28] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.7.2 for details of this structure
@@ -2496,7 +2506,8 @@ SMFMAPDUSessionModification ::= SEQUENCE
     pCCRules                     [19] PCCRuleSet OPTIONAL,
     uPPathChange                 [20] UPPathChange OPTIONAL,
     pFDDataForApp                [21] PFDDataForApp OPTIONAL,
-    ePSPDNConnectionModification [22] EPSPDNConnectionModification OPTIONAL
+    ePSPDNConnectionModification [22] EPSPDNConnectionModification OPTIONAL,
+    alternativeNSSAI             [23] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.7.3 for details of this structure
@@ -2515,7 +2526,8 @@ SMFMAPDUSessionRelease ::= SEQUENCE
     nGAPCause                   [11] NGAPCauseInt OPTIONAL,
     fiveGMMCause                [12] FiveGMMCause OPTIONAL,
     pCCRuleIDs                  [13] PCCRuleIDSet OPTIONAL,
-    ePSPDNConnectionRelease     [14] EPSPDNConnectionRelease OPTIONAL
+    ePSPDNConnectionRelease     [14] EPSPDNConnectionRelease OPTIONAL,
+    alternativeNSSAI            [15] AlternativeNSSAIList OPTIONAL
 }
 
 -- See clause 6.2.3.2.7.4 for details of this structure
@@ -2568,7 +2580,8 @@ SMFMAUnsuccessfulProcedure ::= SEQUENCE
     aMFID                       [14] AMFID OPTIONAL,
     hSMFURI                     [15] HSMFURI OPTIONAL,
     requestType                 [16] FiveGSMRequestType OPTIONAL,
-    sMPDUDNRequest              [17] SMPDUDNRequest OPTIONAL
+    sMPDUDNRequest              [17] SMPDUDNRequest OPTIONAL,
+    alternativeNSSAI            [18] AlternativeNSSAIList OPTIONAL
 }
 
 
@@ -6308,6 +6321,14 @@ AllowedNSSAI ::= SEQUENCE OF NSSAI
 
 AllowedTACs ::= SEQUENCE (SIZE(1..MAX)) OF TAC
 
+AlternativeNSSAIEntry ::= SEQUENCE
+{
+    sNSSAIToBeReplaced [1] SNSSAI,
+    alternativeSNSSAI  [2] SNSSAI
+}
+
+AlternativeNSSAIList ::= SEQUENCE (SIZE(1..8)) OF AlternativeNSSAIEntry
+
 AreaOfInterest ::= SEQUENCE
 {
     areaOfInterestTAIList     [1] AreaOfInterestTAIList OPTIONAL,
diff --git a/testing/asn_lint_exceptions.json b/testing/asn_lint_exceptions.json
index 1ca9aeffc6c427ad8a4a896e7d3769ac698d02f7..c61b5c40d8d1264d01ac248183f1034dad6cd151 100644
--- a/testing/asn_lint_exceptions.json
+++ b/testing/asn_lint_exceptions.json
@@ -75,7 +75,8 @@
         "Tags 167-175 missing in XIRIEvent",
         "Tags 167-175 missing in IRIEvent",
         "Tags 182-185 missing in XIRIEvent",
-        "Tags 182-185 missing in IRIEvent"
+        "Tags 182-185 missing in IRIEvent",
+        "Tag 23 missing in SMFPDUSessionModification"
     ],
     "33128/r19/TS33128Payloads.asn" : [
         "Tag 100 XIRIEvent field 'n9HRPDUSessionInfo' is not present in IRIEvent",