Cisco Presence SRND 9 – Notes

1. The SIP connection between the Cisco IM and Presence Service and Unified CM handles all the phone state presence information exchange.

a. Unified CM configuration requires the Cisco IM and Presence Services to be added as application servers on Unified CM and also requires a SIP trunk pointing to the Cisco IM and Presence Service. The address configured on the SIP trunk could be a Domain Name System (DNS) server (SRV) fully qualified domain name (FQDN) that resolves to the Cisco IM and Presence Services, or it could simply be an IP address of an individual Cisco IM and Presence Service. The Cisco IM and Presence Service handles the configuration of the Cisco Unified Communications Manager application server entry automatically through AXL/SOAP once the administrator adds a node in the system topology page through Cisco IM and Presence administration.

b. Configuration of Cisco IM and Presence occurs through the Unified CM Presence Gateway for presence information exchange with Unified CM. The following information is configured:

Presence Gateway: server_fqdn :5070

Note The server_fqdn could be the FQDN of the Unified CM publisher, a DNS SRV FQDN that resolves to the Unified CM subscriber servers, or an IP address.

If DNS is highly available within your network and DNS SRV is an option, configure the SIP trunk on Unified CM with a DNS SRV FQDN of the Cisco IM and Presence publisher and subscriber. Also configure the Presence Gateway on the Cisco IM and Presence Service with a DNS SRV FQDN of the Unified CM subscribers, equally weighted. This configuration will allow for presence messaging to be shared equally among all the servers used for presence information exchange.

If DNS is not highly available or not a viable option within your network, use IP addressing. When using an IP address, presence messaging traffic cannot be equally shared across multiple Unified CM subscribers because it points to a single subscriber.

Unified CM provides the ability to further streamline communications and reduce bandwidth utilization by means of the service parameter IM and Presence PUBLISH Trunk, which allows for the PUBLISH method (rather than SUBSCRIBE/NOTIFY) to be configured and used on the SIP trunk interface to Cisco IM and Presence. Once the CUP PUBLISH Trunk service parameter has been enabled, the users must be associated with a line appearance and not just a primary extension.

2. The Computer Telephony Integration Quick Buffer Encoding (CTI-QBE) connection between Cisco IM and Presence and Unified CM is the protocol used by presence-enabled users in Cisco IM and Presence to control their associated phones registered to Unified CM. This CTI communication occurs when Cisco Jabber is using Desk Phone mode to do Click to Call or when Microsoft Office Communicator is doing Click to Call through Microsoft Live Communications Server 2005 or Office Communications Server 2007 or Microsoft Lync.

a. Unified CM configuration requires the user to be associated with a CTI Enabled Group, and the primary extension assigned to that user must be enabled for CTI control (checkbox on the Directory Number page). The CTI Manager Service must also be activated on each of the Unified CM subscribers used for communication with the Cisco IM and Presence publisher and subscriber. Integration with Microsoft Live Communications Server 2005 or Office Communications Server 2007 or Microsoft Lync requires that you configure an Application User, with CTI Enabled Group and Role, on Unified CM.

b. Cisco IM and Presence CTI configuration (CTI Server and Profile) for use with Cisco Jabber is automatically created during the database synchronization with Unified CM. All Cisco Jabber CTI communication occurs directly with Unified CM and not through the Cisco IM and Presence Service.

Cisco IM and Presence CTI configuration (Desktop Control Gateway) for use with Microsoft Live Communications Server 2005 or Office Communications Server 2007 or Microsoft Lync requires you to set the Desktop Control Gateway address (Cisco Unified Communications Manager Address) and a provider, which is the application user configured previously in Unified CM. Up to eight Cisco Unified Communications Manager Addresses can be provisioned for increased scalability. Only IP addresses can be used for Desktop Control Gateway configuration in the Cisco IM and Presence Service. Administrators should ensure that any configuration and assignment of Cisco Unified Communications Manager addresses is evenly distributed for the purpose of load balancing.

3. The AXL/SOAP interface handles the database synchronization from Unified CM to populate the Cisco IM and Presence database.

a. No additional configuration is required on Unified CM.

b. Cisco IM and Presence security configuration requires you to set a user and password for the Unified CM AXL account in the AXL configuration.

The Sync Agent Service Parameter, User Assignment, set to balanced by default, will load-balance all users equally across all servers within the Cisco IM and Presence cluster. The administrator can also manually assign users to a particular server in the Cisco IM and Presence cluster by changing the User Assignment service parameter to None .

4. The LDAP interface is used for LDAP authentication of Cisco Jabber users during login. For more information regarding LDAP synchronization and authentication, see the chapter on LDAP Directory Integration.

Unified CM is responsible for all user entries via manual configuration or synchronization directly from LDAP, and Cisco IM and Presence then synchronizes all the user information from Unified CM. If a user logs into the Cisco IM and Presence Service and LDAP authentication is enabled on Unified CM, Cisco IM and Presence will go directly to LDAP for the user authentication using the Bind operation.

When using Microsoft Active Directory, consider the choice of parameters carefully. Performance of Cisco IM and Presence might be unacceptable when a large Active Directory implementation exists and the configuration uses a Domain Controller. To improve the response time of Active Directory, it might be necessary to promote the Domain Controller to a Global Catalog and configure the LDAP port as 3268.

Note Cisco IM and Presence must publish a DNS SRV record (SIP, XMPP, and each text conferencing node) for the domain to allow for other domains to discover the Cisco IM and Presence Services through DNS SRV. With a Microsoft Office Communications Server, Live Communications Server, or Lync Server deployment, this is required because Cisco IM and Presence is configured as a Public IM Provider on the Access Edge server. If the Cisco IM and Presence Service cannot discover the Microsoft domain using DNS SRV, you must configure a static route on Cisco IM and Presence for the external domain.