# Messaging concepts

- [Message](/messaging/messaging-concepts/message.md): Enterprise Integration Patterns PHP
- [Message Channel](/messaging/messaging-concepts/message-channel.md): Message Channel PHP
- [Message Endpoints/Handlers](/messaging/messaging-concepts/message-endpoint.md): Message Endpoint PHP
- [Internal Message Handler](/messaging/messaging-concepts/message-endpoint/service-activator.md): Service Activator PHP
- [Message Router](/messaging/messaging-concepts/message-endpoint/message-routing.md): Message Router PHP
- [Splitter](/messaging/messaging-concepts/message-endpoint/splitter.md): Splitter PHP
- [Consumer](/messaging/messaging-concepts/consumer.md): Consumer PHP
- [Messaging Gateway](/messaging/messaging-concepts/messaging-gateway.md): Message Gateway PHP
- [Inbound/Outbound Channel Adapter](/messaging/messaging-concepts/inbound-outbound-channel-adapter.md): Inbound and Outbound Channel Adapters for external system integration