Assume that you assign a Session Initiation Protocol (SIP) Uniform Resource Identifier (URI) address that only contains numbers to a user in a Microsoft Lync Server 2010 environment. For example, the address that you assign the user is 123456@contoso.com. In this situation, the picture of the user is displayed as a telephone in Microsoft Lync 2010 for iPhone. Additionally, other users cannot send instant messages to this user.
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