Unified Communications

The growing use of Wi-Fi Wi-Fi is a technology that allows electronic devices to connect to a WLAN network, mainly using the 2.4 GHz and 5 GHz radio bands. Wi-Fi can apply to products that use any 802.11 standard. and the proliferation of mobile tablet and smartphone clients cause control and visibility challenges for communication and collaboration applications. To overcome these challenges, Aruba offers the Unified Communications application to manage your enterprise communication ecosystem.

The Unified Communications application on Aruba devices provides a seamless user experience for voice calls, video calls, and application sharing when using communication and collaboration tools. The Unified Communications application actively monitors voice, video, and application sharing sessions, provides traffic visibility, and allows you to prioritize the required sessions. The Unified Communications application also leverages the functions of the service engine on the cloud platform and provides rich visual metrics for analytical purposes.

The Unified Communications application supports the following functions based on the type of device used in the solution:

  • Session visibility—The Unified Communications application provides call session visibility correlated across the network to simplify operations for the network administrator. The administrators can monitor wireless and wired network connectivity health on a per-session basis and analyze the quality of experience.
  • Session prioritization—Based on the type of device provisioned in your network, Aruba Central receives call control information from Instant APs, controllers, and switches. The Unified Communications application uses this data to detect and classify the traffic type and dynamically prioritize the voice and video traffic over data traffic. The heuristics method is used for session prioritization. A built-in heuristics engine detects the Unified Communications traffic and prioritizes the required traffic. The heuristics data detection and classification method is used to identify the clients in a call and classify and prioritize the media packets. Switches do not support heuristics-based prioritization.

When Aruba Central is not reachable, the Instant APs apply default prioritization to the new calls and dashboard visibility is not available for the new calls. Unified Communications-defined call prioritization is applied to in-flight calls.

Unified Communications Versions

Unified Communications is available in version 1 and version 2. The Unified Communications service in Aruba Central automatically determines which version to use based on the Aruba Instant version running on the Instant AP.

In version 1, Unified Communications uses OpenFlow OpenFlow is an open communications interface between control plane and the forwarding layers of a network. protocol to communicate with Instant APs, which run Aruba Instant version lower than

In version 2, Unified Communications uses WebSocket protocol to communicate with Instant APs, which run Aruba Instant version or higher than In version 2, the Instant APs manage the call prioritization based on configuration from Aruba Central and depend on the Unified Communications service only during roaming or session synchronization failures. The Instant APs push the call data visibility information to the Unified Communications service on Aruba Central.


Aruba Central licensing is applicable to Unified Communications applications. Unified Communications is available with Advanced AP licenses.

When Instant APs run Aruba Instant version lower than, Unified Communications uses OpenFlow protocol to communicate with the Instant APs. If 60k flows are not installed on the Instant APs that are pre-subscribed, disable and re-enable Unified Communications. To enable Unified Communications, see Configuring Unified Communications.

Heuristics Classification

For heuristics classifications, the Instant APs perform deep packet inspection on the traffic to determine voice and video traffic. The order of heuristics classifications is detection, prioritization, and visualization. The heuristics classification method includes the following steps:

When Unified Communications starts, the specific ports that are used by signaling protocols are opened and the packets are sent for processing.

The following table lists the port information.

Table 1: Unified Communications Ports

ALG Application Layer Gateway. ALG is a security component that manages application layer protocols such as SIP, FTP and so on. Protocol Port Protocol


TCP Transmission Control Protocol. TCP is a communication protocol that defines the standards for establishing and maintaining network connection for applications to exchange data.






SIP Session Initiation Protocol. SIP is used for signaling and controlling multimedia communication session such as voice and video calls.





The heuristic solution only adjusts the DSCP Differentiated Services Code Point. DSCP is a 6-bit packet header value used for traffic classification and priority assignment. /QoS Quality of Service. It refers to the capability of a network to provide better service and performance to a specific network traffic over various technologies. for the session and provides visibility if the user-role of the client permits the traffic. If traffic is denied by user-role, then the heuristic for that client session is not performed and the D flag is set.

  • Skype for Business, RTP, and Wi-Fi Calling calls are classified using heuristics-based classification.
  • SIP calls are classified using signalling-based classification.

See the following sections for information about configuring and monitoring UCC Unified Communications and Collaboration. UCC is a term used to describe the integration of various communications methods with collaboration tools such as virtual whiteboards, real-time audio and video conferencing, and enhanced call control capabilities.: