Telephone greetings vary by context, such as whether calls are for business or personal matters, or are live or voice mail. For business, a customer support employee might answer with the acknowledgement, "Good day, how may I help you?" Other typical professional greetings are listed on websites such as Grasshopper.com.
Factors affecting how you should phrase a greeting include whether you are calling out or answering the phone, leaving a voice mail or are talking for casual or professional reasons. Websites such as VoiceNation.com and EveryVoiceMail.com provide scripts for standard voice mail greetings. The most appropriate greetings observe good etiquette and politeness, leaving the person on the other side of the phone with a favorable impression.