In others, you don't even have a phone on your desk, while others still rely entirely on remote employees. In some office structures, you call first. It doesn't take into account individual office cultures. NOTE: This handy guide is intended to break down the mysterious social contract that seems to be in place in many offices today. In an era of multimodal office communications, it can be difficult to know which medium to choose for each message. Have you ever felt inconvenienced by an unexpected phone call at the wrong time? Has an email message ever come across as too aggressive? At one time or another, everyone has chosen the wrong form of communication to send a message to a colleague or customer.