Federation

The Access Edge Server also provides the capability to federate with other organizations that have deployed Lync Server, meaning the two organizations can communicate with each other as if it were a single deployment.

Users have different feature sets available when using federation, depending on the version of Lync Server a partner has deployed. The feature set is the lowest common denominator between the two organizations. For example, if a partner runs Live Communications Server 2005, only IM and presence will be available. However, if a partner organization is running Office Communications Server 2007 R2, A/V and Desktop Sharing features can be used through federation. The largest feature set is available if both organizations are running Lync Server 2013.

Access Edge Servers use certificates and Mutual TLS (MTLS) to secure the SIP signaling used across the Internet with each other. This ensures that instant messaging and presence traffic is completely secure and is never transmitted in plain text.

Note

Organizations most often procure a certificate from a public certificate authority so that partners trust their server by default. However, it is possible to exchange certificate chains with a partner to support additional certificate authorities.

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