Collaboration Edge Deployment Model
With increasing focus on teleworking and remote workers, enterprise collaboration resources are required to be extended beyond traditional collaboration borders. This border between an enterprise Unified Communications network and the outside world is referred to as the Collaboration Edge. Collaboration Edge services offer access to enterprise network resources from the outside world via multiple mechanisms. The users can be teleworkers working from home, mobile workers with LTE or Wi-Fi Internet access, or users using collaboration applications such as Jabber to make and receive calls to and from the PSTN or enterprise network. Figure 2-8 gives an overview of a Collaboration Edge solution.
Figure 2-8 Cisco Collaboration Edge Solution Overview
The Collaboration Edge solution depends on the requirements of an organization and the technology an organization wishes to leverage. For example, the remote collaboration client access can be categorized into four main categories:
VPN-based access: With endpoints capable of supporting traditional IPsec client or AnyConnect client.
VPN-less access: With clients that traverse the firewall without any VPN client, for example Cisco Expressway solution.
Business-to-business communications: Leveraging CUBE for B2B audio and video calls/conferencing.
IP PSTN access: Leveraging ITSP SIP trunks instead of traditional PSTN trunks. CUBE yet again plays an important and integral part in connecting the enterprise network to ITSP.
The next section addresses CUCM call processing redundancy.