diff --git a/sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md b/sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md
index fb7bdc4d6d32..62e74ebff15c 100644
--- a/sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md
+++ b/sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md
@@ -9,6 +9,7 @@
 ### Bugs Fixed
 
 - Fixes the session message disposition to use management node as fall back. ([#39913](https://github.com/Azure/azure-sdk-for-java/issues/ 39913))
+- Fixes the session processor idle timeout to fall back to RetryOptions::tryTimeout. ([#39993](https://github.com/Azure/azure-sdk-for-java/issues/39993))
 
 ### Other Changes
 
diff --git a/sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/SessionsMessagePump.java b/sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/SessionsMessagePump.java
index c9cc2b352fd3..2afe6d63cedc 100644
--- a/sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/SessionsMessagePump.java
+++ b/sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/SessionsMessagePump.java
@@ -167,7 +167,7 @@ final class SessionsMessagePump {
         this.instrumentation = Objects.requireNonNull(instrumentation, "'instrumentation' cannot be null");
         this.sessionAcquirer = Objects.requireNonNull(sessionAcquirer, "'sessionAcquirer' cannot be null");
         this.maxSessionLockRenew = Objects.requireNonNull(maxSessionLockRenew, "'maxSessionLockRenew' cannot be null.");
-        this.sessionIdleTimeout = sessionIdleTimeout;
+        this.sessionIdleTimeout = sessionIdleTimeout != null ? sessionIdleTimeout : retryPolicy.getRetryOptions().getTryTimeout();
         this.maxConcurrentSessions = maxConcurrentSessions;
         this.concurrencyPerSession = concurrencyPerSession;
         this.prefetch = prefetch;
diff --git a/sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/IntegrationTestBase.java b/sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/IntegrationTestBase.java
index 8f0457dd89b3..dabb1b7d6e01 100644
--- a/sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/IntegrationTestBase.java
+++ b/sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/IntegrationTestBase.java
@@ -473,10 +473,16 @@ protected final Configuration v1OrV2(boolean isV2) {
         if (isV2) {
             configSource.put("com.azure.messaging.servicebus.nonSession.asyncReceive.v2", "true");
             configSource.put("com.azure.messaging.servicebus.nonSession.syncReceive.v2", "true");
+            configSource.put("com.azure.messaging.servicebus.session.processor.asyncReceive.v2", "true");
+            configSource.put("com.azure.messaging.servicebus.session.reactor.asyncReceive.v2", "true");
+            configSource.put("com.azure.messaging.servicebus.session.syncReceive.v2", "true");
             configSource.put("com.azure.messaging.servicebus.sendAndManageRules.v2", "true");
         } else {
             configSource.put("com.azure.messaging.servicebus.nonSession.asyncReceive.v2", "false");
             configSource.put("com.azure.messaging.servicebus.nonSession.syncReceive.v2", "false");
+            configSource.put("com.azure.messaging.servicebus.session.processor.asyncReceive.v2", "false");
+            configSource.put("com.azure.messaging.servicebus.session.reactor.asyncReceive.v2", "false");
+            configSource.put("com.azure.messaging.servicebus.session.syncReceive.v2", "false");
             configSource.put("com.azure.messaging.servicebus.sendAndManageRules.v2", "false");
         }
         return new ConfigurationBuilder(configSource)