Webex App users, while using Unified Communications Manager for Calling, can only access the local call history. This creates inconsistency across devices in the shared line case when the users are not logged into the App. One of the concerns is that users cannot receive missed call notifications in such situations and must check different devices to find the call history and call back.

With this release, we are enabling the Webex App to use a centralized call history. This eliminates the previously mentioned inconsistencies and provides a better user experience. This feature is supported from Webex 44.11 onwards.

To use this feature, you must onboard the Unified Communications Manager node through Webex Cloud-Connected UC. For more information, see Set up Webex Cloud-Connected UC for on-premises devices.

From Release 15SU2 onwards, the IP Addressing Mode Preference for Media enterprise parameter is overridden when calls are made over an SME cluster to a dual-stack supported device. The destination cluster sends both the IP addresses (IPv4 and IPv6) for all media lines in its offer SDP to the subsequent Unified CM servers. This reduces the chances of MTP allocation due to IP mode mismatch.

For more information, see the 'Configure IP Addressing Preference for Cluster' section in the "Configure IPv6 Stack" chapter of the System Configuration Guide for Cisco Unified Communications Manager.

As an ongoing effort to improve accessibility improvements, the Self Care Portal is enhanced with the following for this release:

• Introduction to sitemap helps users to navigate to the pages and files that are important in the Self Care Portal. Sitemap provides links to the main phone functionalities in the portal for easy navigation.

• Fixing of critical issues that are related to keyboard navigation and screen reader announcements.

The External Database Clean-up Utility interface in the IM and Presence Service is enhanced for easier and more productive use by administrators. The enhancements include a new landing page for easier access to the clean-up jobs and a clear division between manual and automatic clean-up jobs. In addition, it includes the capability to individually configure and track the life cycle of the automatic clean-up job for the IM and Presence Service clusters.

For more information, see the Online Help and Database Setup Guide for the IM and Presence Service, Release 15 and SUs.

As part of this release, improvements have been made to the user interfaces to use inclusive language. For more information on Inclusive Language policies and considerations throughout for any Cisco products see, Inclusive Language policies and considerations throughout for any Cisco products.

The multi line support feature for UCM Calling allows administrators to configure multiple phone numbers for a single user. You can assign these numbers to the user’s Webex App and devices, with each number independently being able to make and receive calls. Currently, the maximum number of phone numbers that can be assigned to a mobile Webex application is eight. This capability enables users to manage multiple calls simultaneously, thus enhancing efficiency, and productivity. This feature is supported from Webex 44.12 onwards.

Previously, we supported this feature exclusively on the desktop version of the Webex App. With the latest release, we are extending support to the mobile version as well. Mobility is a crucial aspect of enterprise calling because it ensures that users remain connected and productive while on the move.

Note

The maximum number of phone numbers that can be assigned to a desktop Webex application is enhanced from eight to ten. Download and install the cmterm-webex-desktop-10-Lines-241115.k4.cop.sha512 COP file from CCO to use this enhancement. Mobile users having Mobile Identity (MI) configured cannot place or receive calls. Install the ciscocm.V15SU2_CSCwm77174-multiline_v1.zip file from CCO to use this feature.

From this release, IM and Presence Service's Calendar Integration with Office 365 feature is enhanced to allow configurable AD Authentication Endpoint and Resource URI values. This is achieved through the AD Authentication Endpoint and Resource URI fields which are introduced in the Presence Gateway Configuration page. These fields are auto populated with default values which can be modified as required.

For more information, see the ‘Configure a Presence Gateway’ section of the Microsoft Outlook Calendar Integration for the IM and Presence Service, Release 15 and SUs.

With this release, Unified Communications Manager has mandated that you can enable or disable SAML SSO only if the DB services are up and running across all the nodes in the cluster.

Run the utils service list administrative command (A Cisco DB) that retrieves the list of all services to check the DB status.

From this release, Call Home as a transport mode for smart licensing is deprecated. Smart Transport mode, the new transport mode, is introduced for smart licensing. All freshly installed Unified Communications Manager nodes support only Smart Transport.

Post upgrade or migration, Unified Communications Manager automatically switches to Smart Transport if connection to the endpoints “smartreceiver.cisco.com” is successful. In case of connection failure, Unified CM falls back to the Call Home mode.

For more information, see the System Configuration Guide for Cisco Unified Communications Manager.

Before this release, Cisco TSP enabled you to configure only a primary and secondary CTI Manager. From this release onwards, Cisco TSP enables you to configure a tertiary CTI Manager. When the tertiary CTI Manager is configured, it is treated as the least priority server. Cisco TSP connects to it only when connectivity to both the primary and secondary CTI Managers is lost. The TSP remains connected to tertiary by default unless you have explicitly enabled and configured a valid choice for fallback settings.

For more information, see the ‘Support for Tertiary CTI Manager and Fallback’ section in the "Overview" chapter of the Cisco Unified TAPI Developers Guide for Cisco Unified Communications Manager Release.

TLS 1.3 is the highest version of the Transport Layer Security (TLS) protocol supported from this release onwards.

TLS 1.3 is faster and more secure than older versions of TLS. One of the key improvements in TLS 1.3 is the reduction in handshake latency. It significantly enhances the performance of time-sensitive applications. Moreover, TLS 1.3 also reduces round-trip times (RTT), by further optimizing the connection establishment process. TLS 1.3 has dropped support for older and less secure cryptographic algorithms.

For more information about the TLS 1.3 support limitations on IM and Presence Service, see the 'Set Minimum TLS Version' section in the "TLS 1.3 Setup" chapter of the Security Guide for Cisco Unified Communications Manager, Release 15 and SUs.

Cisco Unified Communications Manager (Unified Communications Manager) requirements for the Cisco Desk Phone 9800 Series include:

• Unified Communications Manager 12.5(1)SU9, 14SU4 and later, or 15SU2 and later (To be FCSed around October 2024).

• Installation of the following Cisco Options Package (COP) files on Unified Communications Manager: Phone firmware—Firmware for the Cisco Desk Phone 9800 Series phones is not bundled with Unified Communications Manager. A firmware update may be required to enable the new features. The phone firmware COP files can be downloaded from Cisco.com.

For information on the list of supported features for the Cisco Desk Phone 9800 Series, see the Release Notes for Cisco Desk Phone 9800 Series.

Location Bandwidth Manager (LBM) running on Unified Communication Manager version 15 cannot communicate with Unified CM versions with a newer version of Release 15 (for example, Release 15 SU1 or later). Hence, we recommend that you do the following if you are using LBM across multiple clusters:

• Ensure that you install the ciscocm.V15FCS_CSCwi82830-lbm_C0211-1.cop.sha512 COP file on Unified Communications Manager Release 15 to interoperate with LBM running on Unified Communication Manager versions 15SU1 or later.

Unified Communications Manager Release 15 does not support Remote Call Control with Microsoft Lync Server for IM and Presence Service. If you are using this feature currently in your deployment and you are trying to upgrade to Release 15, you cannot use this feature after the upgrade.

Note	This feature continues to be supported in Releases 12.5.x and 14 and SUs until their EOL/EOS.

For more information, see Deprecation of Remote Call Control with Microsoft Lync Server for IM and Presence Service on Cisco Unified Communications Manager, Release 15.

Starting with Release 15 onwards, phone firmware that is end of support will no longer be included in the Unified Communications Manager ISO. These endpoints will still be allowed to register, unless they have been officially deprecated, but the firmware will not be present in the TFTP directory following a fresh install. For more details, see the ReadMe for Cisco Unified Communications Manager.

From this release onwards, Unified Communications Manager supports secure SIP Lines for Cisco VG410 Analog Voice Gateway that are running on Cisco IOS XE 17.15.1 or above version.