diff --git a/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs b/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs
new file mode 100644
index 0000000..ba6751e
--- /dev/null
+++ b/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs
@@ -0,0 +1,110 @@
+using System;
+using Network.NetworkHost;
+using Network.NetworkTransport;
+
+namespace Network.NetworkApplication
+{
+    public static class NetworkIntegrationFactory
+    {
+        public static SharedNetworkRuntime CreateClientRuntime(
+            string serverIp,
+            int reliablePort,
+            INetworkMessageDispatcher dispatcher,
+            int? syncPort = null,
+            SessionReconnectPolicy reconnectPolicy = null,
+            Func<DateTimeOffset> utcNowProvider = null,
+            IMessageDeliveryPolicyResolver deliveryPolicyResolver = null,
+            SyncSequenceTracker syncSequenceTracker = null,
+            ClockSyncState clockSync = null,
+            Func<string, int, ITransport> transportFactory = null)
+        {
+            if (dispatcher == null)
+            {
+                throw new ArgumentNullException(nameof(dispatcher));
+            }
+
+            ValidateDualPortConfiguration(reliablePort, syncPort);
+
+            transportFactory ??= static (ip, port) => new KcpTransport(ip, port);
+
+            var reliableTransport = transportFactory(serverIp, reliablePort)
+                ?? throw new InvalidOperationException("Reliable transport factory returned null.");
+            var syncTransport = syncPort.HasValue
+                ? transportFactory(serverIp, syncPort.Value)
+                : null;
+
+            if (syncPort.HasValue && syncTransport == null)
+            {
+                throw new InvalidOperationException("Sync transport factory returned null.");
+            }
+
+            return new SharedNetworkRuntime(
+                reliableTransport,
+                dispatcher,
+                reconnectPolicy,
+                utcNowProvider,
+                syncTransport,
+                deliveryPolicyResolver,
+                syncSequenceTracker,
+                clockSync);
+        }
+
+        public static ServerNetworkHost CreateServerHost(
+            int reliablePort,
+            int? syncPort = null,
+            INetworkMessageDispatcher dispatcher = null,
+            SessionReconnectPolicy reconnectPolicy = null,
+            Func<DateTimeOffset> utcNowProvider = null,
+            IMessageDeliveryPolicyResolver deliveryPolicyResolver = null,
+            SyncSequenceTracker syncSequenceTracker = null,
+            Func<int, ITransport> transportFactory = null)
+        {
+            ValidateDualPortConfiguration(reliablePort, syncPort);
+
+            transportFactory ??= static port => new KcpTransport(port);
+
+            var reliableTransport = transportFactory(reliablePort)
+                ?? throw new InvalidOperationException("Reliable transport factory returned null.");
+            var syncTransport = syncPort.HasValue
+                ? transportFactory(syncPort.Value)
+                : null;
+
+            if (syncPort.HasValue && syncTransport == null)
+            {
+                throw new InvalidOperationException("Sync transport factory returned null.");
+            }
+
+            return new ServerNetworkHost(
+                reliableTransport,
+                dispatcher,
+                reconnectPolicy,
+                utcNowProvider,
+                syncTransport,
+                deliveryPolicyResolver,
+                syncSequenceTracker);
+        }
+
+        private static void ValidateDualPortConfiguration(int reliablePort, int? syncPort)
+        {
+            if (reliablePort <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(reliablePort), "Reliable port must be positive.");
+            }
+
+            if (!syncPort.HasValue)
+            {
+                return;
+            }
+
+            if (syncPort.Value <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(syncPort), "Sync port must be positive.");
+            }
+
+            if (syncPort.Value == reliablePort)
+            {
+                throw new ArgumentException("Sync port must differ from reliable port.", nameof(syncPort));
+            }
+        }
+    }
+}
diff --git a/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs.meta b/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs.meta
new file mode 100644
index 0000000..edcf3c2
--- /dev/null
+++ b/Assets/Scripts/Network/NetworkApplication/NetworkIntegrationFactory.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: bfefd18b5face1d4496541e42b3a011b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/NetworkManager.cs b/Assets/Scripts/NetworkManager.cs
index 3f84599..3e6eddc 100644
--- a/Assets/Scripts/NetworkManager.cs
+++ b/Assets/Scripts/NetworkManager.cs
@@ -3,13 +3,15 @@ using System.Net;
 using System.Threading.Tasks;
 using Network.Defines;
 using Network.NetworkApplication;
-using Network.NetworkTransport;
 using UnityEngine;
 using Vector3 = UnityEngine.Vector3;
 
 public class NetworkManager : MonoBehaviour
 {
     private const int MaxNetworkMessagesPerFrame = 32;
+    private const string DefaultServerIp = "127.0.0.1";
+    private const int DefaultReliablePort = 8080;
+    private const int DefaultSyncPort = 8081;
 
     public static NetworkManager Instance;
     private SharedNetworkRuntime _networkRuntime;
@@ -18,6 +20,9 @@ public class NetworkManager : MonoBehaviour
     private Task _networkDrainTask = Task.CompletedTask;
     [SerializeField] private GameObject _wrongWindow;
     [SerializeField] private bool _enableNetworkDiagnosticsOverlay = true;
+    [SerializeField] private string _serverIp = DefaultServerIp;
+    [SerializeField] private int _reliablePort = DefaultReliablePort;
+    [SerializeField] private int _syncPort = DefaultSyncPort;
 
     private void Awake()
     {
@@ -28,9 +33,13 @@ public class NetworkManager : MonoBehaviour
 
     private IEnumerator InitNetwork()
     {
-        var transport = new KcpTransport("127.0.0.1", 8080);
         var dispatcher = new MainThreadNetworkDispatcher();
-        _networkRuntime = new SharedNetworkRuntime(transport, dispatcher);
+        int? syncPort = _syncPort > 0 ? _syncPort : null;
+        _networkRuntime = NetworkIntegrationFactory.CreateClientRuntime(
+            _serverIp,
+            _reliablePort,
+            dispatcher,
+            syncPort: syncPort);
         _networkRuntime.LifecycleChanged += HandleLifecycleChanged;
 
         var startTask = _networkRuntime.StartAsync();
@@ -227,4 +236,4 @@ public class NetworkManager : MonoBehaviour
         _networkRuntime.MessageManager.SendMessage(request, MessageType.LogoutRequest);
         Debug.Log($"Sent logout request to player {playerId}");
     }
-}
\ No newline at end of file
+}
diff --git a/Assets/Tests/EditMode/Network/SharedNetworkFoundationTests.cs b/Assets/Tests/EditMode/Network/SharedNetworkFoundationTests.cs
index bd47304..8cdf072 100644
--- a/Assets/Tests/EditMode/Network/SharedNetworkFoundationTests.cs
+++ b/Assets/Tests/EditMode/Network/SharedNetworkFoundationTests.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Net;
 using System.Threading.Tasks;
 using Google.Protobuf;
@@ -141,6 +142,89 @@ namespace Tests.EditMode.Network
             Assert.That(session.SessionManager.State, Is.EqualTo(ConnectionState.TransportConnected));
         }
 
+        [Test]
+        public void NetworkIntegrationFactory_CreateClientRuntime_WithSyncPort_UsesDistinctTransportsPerLane()
+        {
+            var createdTransports = new Dictionary<int, FakeTransport>();
+            var runtime = NetworkIntegrationFactory.CreateClientRuntime(
+                "127.0.0.1",
+                8080,
+                new ImmediateNetworkMessageDispatcher(),
+                syncPort: 8081,
+                transportFactory: (serverIp, port) =>
+                {
+                    var transport = new FakeTransport();
+                    createdTransports.Add(port, transport);
+                    return transport;
+                });
+            var moveInput = new MoveInput
+            {
+                PlayerId = "shared-player",
+                Tick = 77,
+                MoveX = 1f
+            };
+
+            runtime.MessageManager.SendMessage(moveInput, MessageType.MoveInput);
+            runtime.MessageManager.SendMessage(new Heartbeat(), MessageType.Heartbeat);
+
+            Assert.That(createdTransports.Keys, Is.EquivalentTo(new[] { 8080, 8081 }));
+            Assert.That(runtime.Transport, Is.SameAs(createdTransports[8080]));
+            Assert.That(runtime.SyncTransport, Is.SameAs(createdTransports[8081]));
+            Assert.That(createdTransports[8080].SendCallCount, Is.EqualTo(1));
+            Assert.That(createdTransports[8081].SendCallCount, Is.EqualTo(1));
+        }
+
+        [Test]
+        public void NetworkIntegrationFactory_CreateServerHost_WithSyncPort_UsesDistinctTransportsPerLane()
+        {
+            var createdTransports = new Dictionary<int, FakeTransport>();
+            var host = NetworkIntegrationFactory.CreateServerHost(
+                9000,
+                syncPort: 9001,
+                transportFactory: port =>
+                {
+                    var transport = new FakeTransport();
+                    createdTransports.Add(port, transport);
+                    return transport;
+                });
+            var moveInput = new MoveInput
+            {
+                PlayerId = "server-player",
+                Tick = 88,
+                MoveY = 1f
+            };
+
+            host.MessageManager.SendMessage(moveInput, MessageType.MoveInput);
+            host.MessageManager.SendMessage(new Heartbeat(), MessageType.Heartbeat);
+
+            Assert.That(createdTransports.Keys, Is.EquivalentTo(new[] { 9000, 9001 }));
+            Assert.That(host.Transport, Is.SameAs(createdTransports[9000]));
+            Assert.That(host.SyncTransport, Is.SameAs(createdTransports[9001]));
+            Assert.That(createdTransports[9000].SendCallCount, Is.EqualTo(1));
+            Assert.That(createdTransports[9001].SendCallCount, Is.EqualTo(1));
+        }
+
+        [Test]
+        public void NetworkIntegrationFactory_CreateServerHost_WithoutSyncPort_PreservesSingleTransportFallback()
+        {
+            var reliableTransport = new FakeTransport();
+            var host = NetworkIntegrationFactory.CreateServerHost(
+                9000,
+                transportFactory: _ => reliableTransport);
+            var moveInput = new MoveInput
+            {
+                PlayerId = "fallback-player",
+                Tick = 99,
+                MoveX = -1f
+            };
+
+            host.MessageManager.SendMessage(moveInput, MessageType.MoveInput);
+
+            Assert.That(host.Transport, Is.SameAs(reliableTransport));
+            Assert.That(host.SyncTransport, Is.Null);
+            Assert.That(reliableTransport.SendCallCount, Is.EqualTo(1));
+        }
+
         private static byte[] BuildEnvelope(MessageType type, IMessage payload)
         {
             return new Envelope
diff --git a/TODO.md b/TODO.md
index e595726..6c9d9df 100644
--- a/TODO.md
+++ b/TODO.md
@@ -117,15 +117,15 @@ Acceptance:
 
 ### 9. Wire Dual Transports In The Integration Layer
 
-- [ ] Update the client integration entry point, likely [`Assets/Scripts/NetworkManager.cs`](D:/Learn/GameLearn/UnityProjects/NetworkFW/Assets/Scripts/NetworkManager.cs)
-- [ ] Update the server startup integration point
-- [ ] Instantiate one reliable transport and one sync transport
-- [ ] Ensure runtime construction uses both transports instead of a single shared instance
+- [x] Update the client integration entry point, likely [`Assets/Scripts/NetworkManager.cs`](D:/Learn/GameLearn/UnityProjects/NetworkFW/Assets/Scripts/NetworkManager.cs)
+- [x] Update the server startup integration point
+- [x] Instantiate one reliable transport and one sync transport
+- [x] Ensure runtime construction uses both transports instead of a single shared instance
 
 Acceptance:
 
-- [ ] Runtime uses logical dual-lane routing backed by two transport instances
-- [ ] Logging or tests confirm movement/state traffic and reliable event traffic are separated
+- [x] Runtime uses logical dual-lane routing backed by two transport instances
+- [x] Logging or tests confirm movement/state traffic and reliable event traffic are separated
 
 ### 10. Build And Test
 
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/.openspec.yaml b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/.openspec.yaml
new file mode 100644
index 0000000..65bf7c9
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-03-28
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/design.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/design.md
new file mode 100644
index 0000000..0bc2881
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/design.md
@@ -0,0 +1,55 @@
+## Context
+
+The shared networking layer already separates reliable messaging from sync-heavy traffic conceptually, but the runtime integration path still tends to compose a single transport dependency and leaves lane selection to host-specific setup. This makes the dual-transport design incomplete: shared services can express sync intent, yet composition can still collapse both lanes into one implicit path. The repository also requires preserving the existing client single-session flow and avoiding Unity-specific dependencies in shared networking code.
+
+## Goals / Non-Goals
+
+**Goals:**
+- Allow integration-layer composition to pass both reliable and sync transports into shared networking services.
+- Keep the single-transport path valid by falling back to the reliable transport when no dedicated sync transport is configured.
+- Centralize lane selection inside shared networking/session code so client and server hosts follow the same wiring rules.
+- Add regression coverage for both client single-session and server multi-session composition paths.
+
+**Non-Goals:**
+- Redesign transport implementations or message schemas.
+- Introduce Unity-only adapters into `Assets/Scripts/Network/`.
+- Change message delivery policy beyond what is required to connect existing sync traffic to the proper transport.
+
+## Decisions
+
+### Decision: Treat sync transport as an optional secondary dependency
+The integration layer will accept a primary reliable transport and an optional sync transport. Shared services will retain a deterministic fallback to the primary transport when the secondary dependency is absent.
+
+This preserves existing callers and lets the change land without forcing all hosts to upgrade in one step.
+
+Alternative considered: require dual transports everywhere. Rejected because it would break the current single-session client setup and create unnecessary migration pressure.
+
+### Decision: Keep transport ownership at session/runtime composition boundaries
+Session managers, message managers, or equivalent composition roots should receive both transport references during construction so downstream routing logic can stay host-agnostic.
+
+This keeps transport selection in shared code and prevents Unity or host bootstrapping layers from re-implementing routing rules.
+
+Alternative considered: inject a host-side selector callback. Rejected because it spreads transport policy across hosts and makes regression coverage weaker.
+
+### Decision: Encode fallback behavior in requirements and tests
+The change will specify that sync-routed traffic uses the sync transport when available and otherwise uses the primary reliable transport. Tests should cover both client single-session and server multi-session variants.
+
+Alternative considered: rely on implementation comments only. Rejected because the fallback contract is easy to regress during future refactors.
+
+## Risks / Trade-offs
+
+- [Risk] Integration constructors may grow more complex with optional transport parameters. → Mitigation: keep the extra dependency scoped to composition roots and default the sync transport explicitly.
+- [Risk] Hosts may accidentally provide mismatched transport instances across session types. → Mitigation: express wiring requirements in specs and add regression tests for composition paths.
+- [Risk] Existing tests may only cover single-session client behavior. → Mitigation: add server multi-session coverage as part of the task list.
+
+## Migration Plan
+
+1. Extend composition APIs to accept the optional sync transport without breaking existing call sites.
+2. Update shared routing/session initialization to store and use both dependencies.
+3. Add or adjust edit-mode tests for fallback and dedicated sync-lane behavior.
+4. Rollback, if needed, by removing the optional sync transport wiring while retaining the original single-transport constructor path.
+
+## Open Questions
+
+- Which concrete integration types currently own transport composition for client and server entry points?
+- Are there any message categories besides sync traffic that should explicitly target the secondary transport at composition time?
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/proposal.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/proposal.md
new file mode 100644
index 0000000..175b175
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/proposal.md
@@ -0,0 +1,26 @@
+## Why
+
+The networking stack already distinguishes between reliable gameplay messaging and high-frequency sync traffic, but the integration layer still assumes a single transport path in its runtime wiring. Step 9 is needed now to expose the dual-transport design at composition time so hosts can route each lane consistently without breaking the existing single-session client path.
+
+## What Changes
+
+- Wire the integration layer so session/runtime composition can accept both a primary reliable transport and a sync transport.
+- Preserve backward-compatible behavior when only the primary transport is provided by continuing to use the reliable path for all traffic that lacks a dedicated sync lane.
+- Update message/session integration contracts so transport selection is resolved in shared networking code rather than by host-specific call sites.
+- Add regression coverage for client single-session and server multi-session integration paths that depend on dual-transport wiring.
+
+## Capabilities
+
+### New Capabilities
+- None.
+
+### Modified Capabilities
+- `shared-network-foundation`: Extend the shared composition contract so network managers and related services can be constructed with dual transports while preserving the existing single-transport fallback.
+- `network-session-lifecycle`: Update runtime/session wiring requirements so sessions initialize and retain both reliable and sync transport dependencies where available.
+- `network-sync-strategy`: Require integration-layer routing to connect sync traffic to the dedicated sync transport instead of relying on host-side manual wiring.
+
+## Impact
+
+- Affected code under `Assets/Scripts/Network/` for integration/composition, session initialization, and transport-aware message dispatch.
+- Edit-mode regression tests under `Assets/Tests/EditMode/Network/`.
+- No Unity-specific dependency changes; Unity adapters should remain outside shared networking code.
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-session-lifecycle/spec.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-session-lifecycle/spec.md
new file mode 100644
index 0000000..e52b04b
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-session-lifecycle/spec.md
@@ -0,0 +1,12 @@
+## ADDED Requirements
+
+### Requirement: Sessions retain dual transport wiring
+Session lifecycle components SHALL initialize session-scoped networking services with both the primary reliable transport and the optional sync transport supplied by the integration layer.
+
+#### Scenario: Client single-session initialization with dual transports
+- **WHEN** the client integration path creates a single session and a sync transport is configured
+- **THEN** the session-scoped services SHALL retain both transport references for subsequent message routing
+
+#### Scenario: Server multi-session initialization with fallback transport
+- **WHEN** the server integration path creates session-scoped services without a dedicated sync transport
+- **THEN** each session SHALL continue to initialize successfully and SHALL use the primary reliable transport as the fallback lane
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-sync-strategy/spec.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-sync-strategy/spec.md
new file mode 100644
index 0000000..2e77d25
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/network-sync-strategy/spec.md
@@ -0,0 +1,12 @@
+## ADDED Requirements
+
+### Requirement: Integration wiring enforces sync lane selection
+The networking stack SHALL route sync-designated traffic through the sync transport when the integration layer provides one, and SHALL fall back to the primary reliable transport when it does not.
+
+#### Scenario: Dedicated sync transport available
+- **WHEN** sync-designated traffic is sent from a session whose integration wiring includes a sync transport
+- **THEN** the traffic SHALL be dispatched on the sync transport instead of the primary reliable transport
+
+#### Scenario: Dedicated sync transport unavailable
+- **WHEN** sync-designated traffic is sent from a session whose integration wiring does not include a sync transport
+- **THEN** the traffic SHALL be dispatched on the primary reliable transport without failing session operation
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/shared-network-foundation/spec.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/shared-network-foundation/spec.md
new file mode 100644
index 0000000..9520d48
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/specs/shared-network-foundation/spec.md
@@ -0,0 +1,12 @@
+## ADDED Requirements
+
+### Requirement: Shared network composition accepts dual transports
+The shared networking composition layer SHALL allow construction of network managers and related shared services with a primary reliable transport and an optional sync transport.
+
+#### Scenario: Integration receives both transports
+- **WHEN** a host composes the shared networking stack with both a reliable transport and a sync transport
+- **THEN** the shared composition path SHALL retain both dependencies for downstream routing and session services
+
+#### Scenario: Integration receives only one transport
+- **WHEN** a host composes the shared networking stack with only the reliable transport
+- **THEN** the shared composition path SHALL remain valid and SHALL treat the reliable transport as the fallback lane for traffic without a dedicated secondary transport
diff --git a/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/tasks.md b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/tasks.md
new file mode 100644
index 0000000..ae572c6
--- /dev/null
+++ b/openspec/changes/archive/2026-03-28-wire-dual-transports-integration-layer/tasks.md
@@ -0,0 +1,17 @@
+## 1. Extend Integration Composition
+
+- [x] 1.1 Identify the shared integration/composition entry points that currently construct networking services with a single transport.
+- [x] 1.2 Update the relevant constructors or factory methods to accept an optional sync transport alongside the primary reliable transport.
+- [x] 1.3 Preserve backward-compatible call paths so existing single-transport composition still builds and defaults correctly.
+
+## 2. Wire Dual Transports Through Session Services
+
+- [x] 2.1 Update session-scoped networking services to retain both transport references provided by the integration layer.
+- [x] 2.2 Route sync-designated traffic to the sync transport when present and fall back to the reliable transport otherwise.
+- [x] 2.3 Ensure the shared wiring keeps host-specific transport policy out of Unity-only or integration call sites.
+
+## 3. Verify Regression Coverage
+
+- [x] 3.1 Add or update edit-mode tests for client single-session composition with both reliable and sync transports.
+- [x] 3.2 Add or update edit-mode tests for server multi-session composition when no dedicated sync transport is provided.
+- [x] 3.3 Run `dotnet build Network.EditMode.Tests.csproj -v minimal` and `dotnet test Network.EditMode.Tests.csproj --no-build -v minimal` after implementation.
diff --git a/openspec/specs/network-session-lifecycle/spec.md b/openspec/specs/network-session-lifecycle/spec.md
index 92fd500..d5f9c03 100644
--- a/openspec/specs/network-session-lifecycle/spec.md
+++ b/openspec/specs/network-session-lifecycle/spec.md
@@ -41,4 +41,15 @@ The shared networking core SHALL manage timeout detection, disconnect transition
 #### Scenario: Login failure is distinct from transport disconnect
 - **WHEN** authentication or login fails while the transport session is still active
 - **THEN** the shared lifecycle reports a login-failed state for that managed session
-- **THEN** hosts can handle that failure separately from a transport disconnect or heartbeat timeout
\ No newline at end of file
+- **THEN** hosts can handle that failure separately from a transport disconnect or heartbeat timeout
+
+### Requirement: Sessions retain dual transport wiring
+Session lifecycle components SHALL initialize session-scoped networking services with both the primary reliable transport and the optional sync transport supplied by the integration layer.
+
+#### Scenario: Client single-session initialization with dual transports
+- **WHEN** the client integration path creates a single session and a sync transport is configured
+- **THEN** the session-scoped services SHALL retain both transport references for subsequent message routing
+
+#### Scenario: Server multi-session initialization with fallback transport
+- **WHEN** the server integration path creates session-scoped services without a dedicated sync transport
+- **THEN** each session SHALL continue to initialize successfully and SHALL use the primary reliable transport as the fallback lane
diff --git a/openspec/specs/network-sync-strategy/spec.md b/openspec/specs/network-sync-strategy/spec.md
index e8adb61..17e32f6 100644
--- a/openspec/specs/network-sync-strategy/spec.md
+++ b/openspec/specs/network-sync-strategy/spec.md
@@ -59,4 +59,15 @@ The shared networking core SHALL process server-tick or clock-synchronization sa
 #### Scenario: Hosts can consume smoothed clock data for prediction
 - **WHEN** prediction or reconciliation code needs the current server-time estimate
 - **THEN** it reads that estimate from the clock-sync strategy or state object
-- **THEN** it does not query `SessionManager` for authoritative clock ownership
\ No newline at end of file
+- **THEN** it does not query `SessionManager` for authoritative clock ownership
+
+### Requirement: Integration wiring enforces sync lane selection
+The networking stack SHALL route sync-designated traffic through the sync transport when the integration layer provides one, and SHALL fall back to the primary reliable transport when it does not.
+
+#### Scenario: Dedicated sync transport available
+- **WHEN** sync-designated traffic is sent from a session whose integration wiring includes a sync transport
+- **THEN** the traffic SHALL be dispatched on the sync transport instead of the primary reliable transport
+
+#### Scenario: Dedicated sync transport unavailable
+- **WHEN** sync-designated traffic is sent from a session whose integration wiring does not include a sync transport
+- **THEN** the traffic SHALL be dispatched on the primary reliable transport without failing session operation
diff --git a/openspec/specs/shared-network-foundation/spec.md b/openspec/specs/shared-network-foundation/spec.md
index b81caef..94b4577 100644
--- a/openspec/specs/shared-network-foundation/spec.md
+++ b/openspec/specs/shared-network-foundation/spec.md
@@ -69,4 +69,15 @@ The shared network foundation SHALL include host-agnostic session lifecycle orch
 #### Scenario: Server host composes shared foundation with multi-session orchestration
 - **WHEN** a non-Unity server host constructs the runtime networking stack for multiple remote peers
 - **THEN** it uses the shared transport and message-routing foundation together with shared multi-session lifecycle orchestration
-- **THEN** server-specific cleanup, admission, and gameplay reactions stay in the server host adapter rather than forking the shared lifecycle contract
\ No newline at end of file
+- **THEN** server-specific cleanup, admission, and gameplay reactions stay in the server host adapter rather than forking the shared lifecycle contract
+
+### Requirement: Shared network composition accepts dual transports
+The shared networking composition layer SHALL allow construction of network managers and related shared services with a primary reliable transport and an optional sync transport.
+
+#### Scenario: Integration receives both transports
+- **WHEN** a host composes the shared networking stack with both a reliable transport and a sync transport
+- **THEN** the shared composition path SHALL retain both dependencies for downstream routing and session services
+
+#### Scenario: Integration receives only one transport
+- **WHEN** a host composes the shared networking stack with only the reliable transport
+- **THEN** the shared composition path SHALL remain valid and SHALL treat the reliable transport as the fallback lane for traffic without a dedicated secondary transport