IP Telephony Protocols
In the previous section, we introduced several protocols that CallManager uses to
communicate with IP telephony devices.As we discussed in the introduction to
this chapter, Cisco is attempting to create an open ecosystem of partners and solutions,
with the end goal being to let the organizations decide which product or service
best suits them. Supporting several different IP telephony protocols is an
important step in this process. It would have been much easier for the Cisco
product development team to only support one set of protocols when designing
their IP telephony solutions, but by supporting several, they have opened the door
to numerous vendors to work within the AVVID framework. Discussed in the next
sections, are some of the most common protocols that CallManager can use to
communicate.This is by no means a definitive list of all the protocols CallManager
will support.As new versions of CallManager become available, the number of supported
protocols will also grow.As always, it is a good idea to consult the Cisco
Web site for the most up-to-date information regarding this support.