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Procedure

Administrative credentials or roles required

service entries, you must be at least a member of the RTCUniversalServerAdmins group.

Enable users for Enterprise Voice

RTCUniversalUserAdmins group

Device Update Service

Deployment

Device Update Service is automatically installed on the Web Components Server. There are no specific deployment permissions needed outside those required to deploy Standard Edition or Enterprise Edition.

Security Levels

The security levels required for deploying Office Communications Server 2007 R2 depend on the components your organization plans to deploy.

Exchange UM Security Levels

An Exchange Unified Messaging (UM) dial plan supports three different security levels: Unsecured, SIPSecured, and Secured. You configure security levels by means of the VoipSecurity parameter of the UM dial plan. The following table shows appropriate dial plan security levels depending on whether mutual TLS (MTLS) and/or Secure Real-Time Transport Protocol (SRTP) are enabled or disabled.

Table 2. VoipSecurity Values for Various Combinations of Mutual TLS and SRTP

Security level

Mutual TLS

SRTP

Unsecured

Disabled

Disabled

SIPSecured

Enabled (required)

Disabled

Secured

Enabled (required)

Enabled (required)

When integrating Exchange UM with Communications Server 2007 R2, you need to select the most appropriate dial plan security level for each voice profile. In making this selection, you should consider the following:

MTLS is required between Exchange UM and Office Communications Server. Therefore, the dial plan security level must not be set to Unsecured.

When dial plan security is set to SIPSecured, SRTP is disabled. In this case, the Office Communicator 2007 R2 client encryption level must be set to either rejected or optional.

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