1. Clients and servers exchange messages in a request response messaging pattern. 2. NO CARRIER is a response message that is defined in the Hayes command set. 3. Then, if required, IMS enqueues a response message back onto the IMS message queue. 4. If the request was invalid, the DVCS generates a response message containing an appropriate error notification. 5. The service provider transmits the response message over a separate connection to the wsa : ReplyTo endpoint. 6. This API is useful when the calling program knows the size of the response message in advance. 7. This is the request-response messaging pattern. 8. When the recipient Actor is ready to send a response, it sends the response message to the " resumption" 9. UPnP uses UDP port 1900 and all used TCP ports are derived from the SSDP alive and response messages . 10. The client challenge is returned in one 24-byte slot of the response message , the 24-byte calculated response is returned in the other slot.
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