diff --git a/pkg/morph/client/netmap/add_peer.go b/pkg/morph/client/netmap/add_peer.go
index 42117853..b5736a9d 100644
--- a/pkg/morph/client/netmap/add_peer.go
+++ b/pkg/morph/client/netmap/add_peer.go
@@ -22,22 +22,31 @@ func (a *AddPeerPrm) SetNodeInfo(nodeInfo *netmap.NodeInfo) {
 // AddPeer registers peer in NeoFS network through
 // Netmap contract call.
 func (c *Client) AddPeer(p AddPeerPrm) error {
+	var method = addPeerMethod
+
+	if c.client.WithNotary() && c.client.IsAlpha() {
+		// In notary environments Alphabet must calls AddPeerIR method instead of AddPeer.
+		// It differs from AddPeer only by name, so we can do this in the same form.
+		// See https://github.com/nspcc-dev/neofs-contract/issues/154.
+		method += "IR"
+	}
+
 	if p.nodeInfo == nil {
-		return fmt.Errorf("nil node info (%s)", addPeerMethod)
+		return fmt.Errorf("nil node info (%s)", method)
 	}
 
 	rawNodeInfo, err := p.nodeInfo.Marshal()
 	if err != nil {
-		return fmt.Errorf("can't marshal node info (%s): %w", addPeerMethod, err)
+		return fmt.Errorf("can't marshal node info (%s): %w", method, err)
 	}
 
 	prm := client.InvokePrm{}
-	prm.SetMethod(addPeerMethod)
+	prm.SetMethod(method)
 	prm.SetArgs(rawNodeInfo)
 	prm.InvokePrmOptional = p.InvokePrmOptional
 
 	if err := c.client.Invoke(prm); err != nil {
-		return fmt.Errorf("could not invoke method (%s): %w", addPeerMethod, err)
+		return fmt.Errorf("could not invoke method (%s): %w", method, err)
 	}
 	return nil
 }
diff --git a/pkg/morph/client/netmap/update_state.go b/pkg/morph/client/netmap/update_state.go
index 695478f1..9bd83f7f 100644
--- a/pkg/morph/client/netmap/update_state.go
+++ b/pkg/morph/client/netmap/update_state.go
@@ -27,8 +27,17 @@ func (u *UpdatePeerPrm) SetState(state netmap.NodeState) {
 
 // UpdatePeerState changes peer status through Netmap contract call.
 func (c *Client) UpdatePeerState(p UpdatePeerPrm) error {
+	method := updateStateMethod
+
+	if c.client.WithNotary() && c.client.IsAlpha() {
+		// In notary environments Alphabet must calls UpdateStateIR method instead of UpdateState.
+		// It differs from UpdateState only by name, so we can do this in the same form.
+		// See https://github.com/nspcc-dev/neofs-contract/issues/225.
+		method += "IR"
+	}
+
 	prm := client.InvokePrm{}
-	prm.SetMethod(updateStateMethod)
+	prm.SetMethod(method)
 	prm.SetArgs(int64(p.state.ToV2()), p.key)
 	prm.InvokePrmOptional = p.InvokePrmOptional