It’s happened to all of us before. A colleague seems to be online via chat, but not responding. So you shoot over an email, but still nothing. You text him, but receive no response. You call his direct line and get voicemail and then finally you call his secretary, who says he out of the office sick today. So many ways to communicate and still nothing.

With the integration of SIP and multiple devices, clients will no longer have to send a “Are you available?” message. Instead, users can integrate all their communication into one number. Laptops, mobile phone and all the applications applied to both, for instance, instant messaging, can allow for one presence and user preferences.

Users can dictate where they are available for voice calls, video chats, instant messaging, texting, or any combination of these or perhaps none at all. Those who are trying to contact the user will receive information on the ways the user would prefer to be contacted, which usually the most efficient way to contact the user.

Instead being faced with various “Away” messages or idle statuses, user presence becomes much clearer for an array of communication devices and can improve efficiency when another person tries to contact the user.

With presence-PBX integration, communication is even more efficient. Those initiating contact can see previous to session initiation if any one is even on the receiving end or whether they are unavailable. In addition, when initiating a session, a user can contact the SIP message server, which initiates the session based on both users’ preferences and availability. User A does not need to try several different devices to get a hold of User B, such as texting, IM-ing, emailing and calling. Rather, he sends one message to a SIP server, who starts a session based on the desired communication device as the appropriate time.