The three supported protocols are SCCP or ‘’, SIP (Session Initiation Protocol), and MGCP.The protocols that are most commonly seen in system deployments are SIP or SCCP.To further complicate this task, the information available on configuring the newer and more user-preferred devices (touch screens, color backlit display, etc.) is extremely sparse and largely unconfirmed.After heading up the deployment of 3 small Asterisk based PBX deployments, all of which were to make use of various different Cisco IP Phone models; a great deal of information about these phones has been collected.All Cisco IP Phones have several different types of firmware available.Each type of firmware is programmed to support a different Vo IP protocol.
Although not “legally” permitted other firmware downloads can often be found through creative internet searching.
Superb call quality, a large easy-to-read display screen and user-friendly button layouts/designs make the Cisco phone models of old and late some of the best hardware available for IP-based phone systems.
However, for all their outstanding advantages, configuring these phones to work with a non-Cisco managed Vo IP network can be a bit of a chore.
For more information on this customized distribution, please see the Asterisk NOW Homepage.
A TFTP (Trivial File Transfer Protocol) Server is not normally required for the setup of an Asterisk IP PBX.