OCS-Office Communications Server Exposed - New Ideas "Inside" – ICE

November 15, 2007
If you want to know more about OCS, this and more than 100 other concepts are explained in a new course called SIP Essentials – OCS-Office Communications Server Special Edition available online or in a classroom. There is also a separate version for channel partners wanting to explore offering Microsoft OCS to their customers. For more go to: http://www.techtionary.com/nacse/istudies-ocs-tc.htm
 
 
The call setup process performed by ICE is shown here. ICE-Interactive Connectivity Establishment uses such protocols as STUN-Simple Traversal of UDP Through NAT, TURN-Traversal Using Relay NAT and Real Specific IP (RSIP). Developed by the IETF's MMUSIC working group, ICE provides a framework to coordinate/unify various NAT traversal techniques. This enables SIP-based VoIP clients to connect/traverse the variety of firewalls that exist between a remote user and a network. 
ICE defines, among other things, a standardized method for SIP-enabled clients (or clients based on other multimedia session protocols) to determine what type of NAT firewall(s) exist between clients and determine a set of IP addresses by which clients can establish contact. ICE also facilitates the transition of the Internet from IPv4 to IPv6, supporting calls between dual-stack and v6 clients behind a 4to6 NAT. ICE also learns/gathers information about the network topology in which the clients exist and the various sets of network addresses.


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