Using a live operator call center is a popular alternative to implementing an in-house phone tree
. One major benefit is that only one call needs to be made to the call center to start the urgent call campaign. Oftentimes the phone tree answering service supports emailed phone tree scripts as well. After the message has been sent, operators begin calling contacts on the phone tree list. However, unlike a typical phone tree, the individuals contacted do not have to contact others on the list. Operators will continue through the list until everyone has been notified, then they confirm this with the list administrator. In the event that some people have not been contacted, the operator can attempt to make another call, call an alternative number, or take a number of other options.