If your business doesn't have the resources to man the phones and respond to every request that comes through your site, you may want to just install a voicemail application like SpeakPipe on your site. Rather than live chat or contact forms, SpeakPipe allows your visitor to record a message using their one-button recorder!
SpeakPipe has several options that range from free to $39 per month. Packages vary, providing different options for the total numbers of messages, duration of the message, storage, number of sites, Facebook pages, email notifications, mobile support and even whitelabeling. If you pay annually, you get a 25% discount.