The IM and Presence Service does not require a node license or software version license. However, you must assign the IM and Presence Service to each IM and Presence Service user.
You can assign IM and Presence on a per user basis, regardless of the number of clients you associate with each user. When you assign IM and Presence to a user, this enables the user to send and receive IMs and also to send and receive presence updates. If the user is not enabled for IM and Presence, no presence updates are allowed for that user.
You can enable a user for IM and Presence in the End User Configuration window in Cisco Unified Communications Manager. See the Cisco Unified Communications Manager Administration Guide for more information.
IM and Presence capabilities are included within both User Connect Licensing (UCL) and Cisco Unified Workspace Licensing (CUWL). Refer to the Cisco Unified Communications Manager Enterprise License Manager User Guide for more information.