Mobile and Remote Access Overview

About Mobile and Remote Access

Cisco Unified Communications Mobile and Remote Access (MRA) is part of the Cisco Collaboration Edge Architecture. It allows endpoints such as Cisco Jabber to have their registration, call control, provisioning, messaging and presence services provided by Cisco Unified Communications Manager (Unified CM) when the endpoint is outside the enterprise network. The Expressway provides secure firewall traversal and line-side support for Unified CM registrations.

The MRA solution provides the following functions:

  • Off-premises access: a consistent experience outside the network for Jabber and EX/MX/SX Series clients

  • Security: secure business-to-business communications

  • Cloud services: enterprise grade flexibility and scalable solutions providing rich Cisco Webex integration and service provider offerings

  • Gateway and interoperability services: media and signaling normalization, and support for non-standard endpoints

Figure 1. Unified Communications: Mobile and Remote Access

Note

Third-party SIP or H.323 devices can register to the Expressway-C and, if necessary, interoperate with Unified CM-registered devices over a SIP trunk.

Figure 2. Typical Call Flow - Signalling and Media Paths

Unified CM provides call control for both mobile and on-premises endpoints. Signaling traverses the Expressway solution between the mobile endpoint and Unified CM. Media traverses the Expressway solution and is relayed between endpoints directly. All media is encrypted between the Expressway-C and the mobile endpoint.

Core Components

Any MRA solution requires Expressway and Unified CM, with MRA-compatible soft clients and/or fixed endpoints. The solution can optionally include the IM and Presence Service and Unity Connection. This guide assumes that the following items are already set up:

Mobile and Remote Access Ports

Information about MRA ports is available in the Cisco Expressway IP Port Usage Configuration Guide at the Cisco Expressway Series Configuration Guides page. This includes ports that can potentially be used between the internal network (where the Expressway-C is located) and the DMZ (where the Expressway-E is located), and between the DMZ and the public internet.

Protocol Summary

The table below lists the protocols and associated services used in the Unified Communications solution.

Table 1. Protocols and Associated Services

Protocol

Security

Service

SIP

TLS

Session establishment – Register, Invite etc.

HTTPS

TLS

Logon, provisioning/configuration, directory, visual voicemail

Media

SRTP

Media - audio, video, content sharing

XMPP

TLS

Instant Messaging, Presence, Federation
Figure 3. Protocol Workload Summary

Jabber Client Connectivity Without VPN

The MRA solution supports a hybrid on-premises and cloud-based service model. This provides a consistent experience inside and outside the enterprise. MRA provides a secure connection for Jabber application traffic and other devices with the required capabilities to communicate without having to connect to the corporate network over a VPN. It is a device and operating system agnostic solution for Cisco Jabber clients on Windows, Mac, iOS and Android platforms.

MRA allows Jabber clients that are outside the enterprise to do the following:

  • Use Instant Messaging and Presence services

  • Make voice and video calls

  • Search the corporate directory

  • Share content

  • Launch a web conference

  • Access visual voicemail


Note

Cisco Jabber Video for TelePresence (Jabber Video) does not work with MRA.