Voicemail
All of our systems come with unlimited voicemail included. This can be set up so that an incoming call might call your phone, then your assistant and then your voicemail, for example. The actual details are completely configurable.
You can pick up your voicemail by dialing a special number, or often simply by pressing a dedicated button on the phone which will also indicate that messages are waiting by flashing a light or similar. But there's lots more choices.
You can arrange to be sent an email telling you that you have a voicemail waiting. This will contain the time of the message, the length, who it was from (so long as you have Caller Line Identity turned on for incoming lines) and can optionally contain the voicemail itself as an attachment.
You can also review your voicemail from a web page. You can see all the messages, when they were sent, who they were from and how long they are. You can choose to listen to them in any order, move them to different folders or delete them.
Queuing
You can set up call queues that distribute incoming calls between extensions, and if everyone is busy plays then music and tells callers how long they are likely to wait and the position in the queue. When an agent answers a call you can elect to tell the agent how long the caller has been waiting.
IVR
IVR is the term used to describe the caller being able to select options by using their phone keypad. You will all be familiar with "Press one for sales...". The Perihelion service offers the ability to construct this type of system, with nested sequences and complex choices.