Implementations of the present application relate to caller preview data and call messages based on caller preview data. In some implementations, a method includes sending, by a caller device, a call request to one or more callee devices, and establishing a connection to at least one callee device prior to receipt of an acceptance of the call request by the callee device. At least a portion of caller preview data is transmitted to the callee device over the connection prior to the receipt of the call acceptance. In response to determining that the at least a portion of the caller preview data has been transmitted for a particular time period without receipt of the acceptance of the call request, information is transmitted to instruct a call message to be stored on the callee device, where the call message includes at least a part of the caller preview data.