You will need a third party service like Berbee's Informacast. This seems to be the most popular App for this type of functionality. Have a look;
InformaCast is a robust, full-featured system that allows users to simultaneously push an audio stream and/or a text message to multiple IP phones, InformaCast IP Speakers, the InformaCast Desktop Agent, and overhead paging systems. An administrator can select a prerecorded message or send a live broadcast through either a password-protected web page or the IP phone services menu.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...