diff --git a/internal/server/call_notifications.go b/internal/server/call_notifications.go
index 29d9b45..f6acd6a 100644
--- a/internal/server/call_notifications.go
+++ b/internal/server/call_notifications.go
@@ -325,11 +325,7 @@ func (s *Server) pollCellularCalls(ctx context.Context) {
 		}
 		calls := parseCLCC(response)
 		for _, call := range calls {
-			direction, _ := call["direction"].(int)
-			state, _ := call["state"].(int)
-			// direction 1 = incoming (Mobile Terminated)
-			// state 4 = incoming/ringing, 5 = waiting, 0 = active, 3 = alerting
-			if direction == 1 && (state == 4 || state == 5 || state == 0 || state == 3) {
+			if isIncomingVoiceCLCC(call) {
 				caller, _ := call["number"].(string)
 				if caller == "" {
 					caller = "未知号码"
@@ -351,3 +347,13 @@ func (s *Server) pollCellularCalls(ctx context.Context) {
 		}
 	}
 }
+
+func isIncomingVoiceCLCC(call map[string]any) bool {
+	direction, _ := call["direction"].(int)
+	state, _ := call["state"].(int)
+	mode, _ := call["mode"].(int)
+	// direction 1 = incoming (Mobile Terminated)
+	// mode 0 = voice; some modems also expose packet-data sessions as CLCC mode 1
+	// state 4 = incoming/ringing, 5 = waiting, 0 = active, 3 = alerting
+	return direction == 1 && mode == 0 && (state == 4 || state == 5 || state == 0 || state == 3)
+}
diff --git a/internal/server/call_notifications_test.go b/internal/server/call_notifications_test.go
index 016ec89..6d7838f 100644
--- a/internal/server/call_notifications_test.go
+++ b/internal/server/call_notifications_test.go
@@ -4,6 +4,8 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"vocat/internal/modem"
 )
 
 func TestIncomingCallNotificationTextFormatting(t *testing.T) {
@@ -61,6 +63,56 @@ func TestIncomingCallDeduplication(t *testing.T) {
 	}
 }
 
+func TestIncomingVoiceCLCCIgnoresDataSessions(t *testing.T) {
+	tests := []struct {
+		name string
+		call map[string]any
+		want bool
+	}{
+		{
+			name: "incoming voice ringing",
+			call: map[string]any{"direction": 1, "state": 4, "mode": 0},
+			want: true,
+		},
+		{
+			name: "incoming voice active",
+			call: map[string]any{"direction": 1, "state": 0, "mode": 0},
+			want: true,
+		},
+		{
+			name: "incoming packet data active",
+			call: map[string]any{"direction": 1, "state": 0, "mode": 1},
+			want: false,
+		},
+		{
+			name: "outgoing voice alerting",
+			call: map[string]any{"direction": 0, "state": 3, "mode": 0},
+			want: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := isIncomingVoiceCLCC(test.call); got != test.want {
+				t.Fatalf("isIncomingVoiceCLCC() = %v, want %v", got, test.want)
+			}
+		})
+	}
+
+	// EC20/EC25 firmware may expose an active packet-data session in CLCC.
+	// It must not be treated as an incoming voice call.
+	dataCalls := parseCLCC(modem.Response{
+		Lines: []string{`+CLCC: 1,1,0,1,0,"",128`},
+		Final: "OK",
+	})
+	if len(dataCalls) != 1 {
+		t.Fatalf("parseCLCC() returned %d data calls, want 1", len(dataCalls))
+	}
+	if isIncomingVoiceCLCC(dataCalls[0]) {
+		t.Fatal("active packet-data CLCC record was treated as an incoming voice call")
+	}
+}
+
 func TestRenderCallWebhookTemplate(t *testing.T) {
 	now := time.Date(2026, 8, 20, 10, 30, 0, 0, time.UTC)
 	message := IncomingCallNotification{