Once you’ve done that, head to the settings menu (the gear icon) on the Google Voice homepage and select Settings. Then, click the Calls tab. In the section “Call Options,” check off “Enable recording (4), Switch (*) and Conference options on inbound calls.” With this setting selected, whenever you make a Google Voice call on your phone, you can tap the number 4 on its dial pad to start recording.
An option with far fewer cables is the RecorderGear PR200. It records your conversation via Bluetooth. The call button in the middle of the device can answer calls on the Bluetooth-connected phone. Hold the PR200 up to your head to talk and listen, as if it's the phone. It also features a USB end to quickly access recordings on the computer. It will hold about 144 hours of conversation before it fills up the 4GB of storage. It also records like any digital recorder sans smartphone, since it has an external pin-hole microphone.

2. “Hi! We’re glad you called [company name]. We’re happy to help but we are either on the line with another client or on the go! Please let us know your name, number, and reason for your call today. As soon as we become available, we will call you right back. Thanks!” Ask your callers to leave a short message so you can determine when to return their call.
Having a dedicated emergency contact will help make sure anything important that comes up is taken care of. Another option is directing callers to a separate answering service.