Call waiting is a standard feature for our VoIP phone systems. If a calling party places a call to a called party which is otherwise engaged, and the called party has the call waiting feature enabled, the called party is able to suspend the current telephone call and switch to the new incoming call (typically, this is done by pushing the flashing button), and can then negotiate with the new or the current caller an appropriate time to ring back. Call waiting, then, alleviates the need to have more than one line for voice communications.
Per extension, Call Waiting is off by default so that IVRs or Automated Attendants can route the call to another representative in your company or send them to voicemail. We can enable this feature on an extension by extension basis or for all extensions upon request.