What is the Call Queue
From VoiceMailTel Wiki
The Call Queue allows you to receive multiple simultaneous calls and have them waiting on hold until one of your representatives is able to pick up the calls. Your callers will listen to music on hold while waiting or even better, you can customize the Call Queue by having a marketing message or announcements played for your callers while they wait.
Call Queue gives your company a big business image, keeps an interaction between you and your callers while they are on hold and also gives you the benefit of never missing a call again.