We have recently had a cisco VOIP solution installed with CCM 5.1 put in. Everything is working great and no problems. However I have noticed that our system is using SCCP as the basis for phones rather than SIP. Eventually when SIP trunking is available in my area I would definitely like to implement it but that would mean an entire reworking of our CCM to change them from SCCP to SIP. So why would our installer use SCCP instead of SIP because from my readings SIP is supposed to be the future of IP telephony.
What adavantages/disadvantages does SIP or SCCP have over each other?
I am aware that with SIP you can do things with presence such as with Cisco Personal Communicator which is nice.
I am just not understanding why a new install would not use SIP other than maybe the installer is not really familiar with SIP installs.
Any and all responses are greatly appreciated.