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Overview

The Interactive Connectivity Establishment (ICE) provides a generic mechanism to assist media in traversing Network Address Translators (NAT) without requiring the endpoints to be aware of their network topology. ICE provides a framework with which a communicating peer can discover and communicate its public IP address so that it can be reached by other peers. ICE allows user agents to discover enough topology information to find communications paths. SDP carries the IP addresses and ports of the call participants that receive RTP streams. Since, NATs alter IP addresses and ports, the exchange of local IP addresses and ports might not be sufficient to establish connectivity. ICE uses protocols such as Simple Traversal of UDP through NAT (STUN) and Traversal Using Relay NAT (TURN) to establish and verify connectivity.

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For more information, see Managing Node-Level SIP Settings and Creating and Modifying SIP Signaling Groups.

Role of

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the 

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The following functions are performed by SBC Edge to the

• For SIP calls involving NAT devices, the 

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  acts as an ICE agent to inter-operates with Microsoft Skype For Business Online environment.
• The

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   communicates to Skype for Business Edge server to get the TURN servers credentials.
• The

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  acts as STUN/TURN client and talk to TURN server in Microsoft Skype For Business Online environment.