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Log on to System Manager by using the appropriate administrative credentials.
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Click .
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Select the user, and then click Edit.
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On the User Profile: Edit: <user name> page, on the Communication Profile tab, click Session Manager Profile.
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In the SIP Registration area, in the Max. Simultaneous Devices field, click 1.
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Clear the Block New Registration When Maximum Registrations Active check box.
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Click Commit.