The service is usually provided by business center;
Client will have a HK telephone number;
People call the HK no., and service provider will answer the call (with your required greeting);
Service provider will advise client about the message, or divert the call according to client's instruction;
Monthly fee of ranges from HK$ 100 to HK$ 400 (depends on service provider and detail service content);
usually, 12 months service fee advance payment is required;