/mcpDescription Service Parameter When users are logged in to one phone and then login to a second phone either in the same cluster or on a different cluster, users can view the login behavior on the second phone based on the Multiple Login Behavior setting defined on the Service Parameter Configuration page. Choose one of the following options from the drop–down list: • Multiple Logins Allowed—You can login to more than one device at a time. • Multiple Logins Not Allowed—You can be logged in to only one device. The login attempts to the second device fails and the phone displays the error code “25” (Multi-Login Not Allowed). You can login successfully, only when you have logged out from the first device. This is the default value. • Auto Logout—When you try to login to a second device (either Extension Mobility or Extension Mobility Cross Cluster), the Cisco Unified Communications Manager automatically logs you out of the first device. This is a required field. Note Multiple login behavior is also applicable between two Extension Mobility Cross Cluster logins. Multiple Login Behavior Choose True to allow the user ID to contain alphanumeric characters. Choosing False allows the user ID to contain only numeric characters. Note The Alphanumeric User ID parameter applies systemwide. You can have a mix of alphanumeric and numeric user IDs. The system supports only user IDs that can be entered by using the alphanumeric keypad. The case-sensitive userid field requires the characters to be lowercase. Alphanumeric User ID When you choose False, the system does not remember the last user who logged in to the phone. Use this option when the user access the phone on a temporary basis only. Choose True to remember the last user that logged into the phone. Use this option when a phone has only one user. For example, Cisco Extension Mobility is used to enable the types of calls that are allowed from a phone. Individuals who are not logged in and who are using their office phone can make only internal or emergency calls. But after logging in using Cisco Extension Mobility, the user can make local, long-distance, and international calls. In this scenario, only this user regularly logs in to the phone. It makes sense to set the Cisco Extension Mobility to remember the last user ID that logged in. Remember the Last User Logged In Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 411 Receiving Calls Extension Mobility Service Parameters