The following are examples of Simple & Enterprise Deployments based on Microsoft documentation. It is highly unlikely that these configurations will “fit all sizes” and after considerable research, please see read this as guidelines, not absolute configurations. Here are the major configurations:
1 - Simple Deployment Path - Internal Access Only
Standard Edition Server
Scale - one server (up to 2,000 users)
Features
- IM/Presence/Conferencing including A/V, Web, IM conferencing)
- Integrated address book server (ABS)
2 - Simple Deployment Path with External Access
Standard Edition Server
Scale - two servers (up to 2,000 users)
Features
- IM/Presence/Conferencing including A/V, Web, IM conferencing)
- Integrated address book server (ABS)
3 - Simple Deployment Path with CWA & Archiving
Standard Edition Server (CWA-Communicator Web Access)
Scale - five servers (one mediation server) (up to 2,000 users)
Features
- IM/Presence/Conferencing including A/V, Web, IM conferencing)
- PSTN-Public Switched Telephone Network access
4 - Enterprise Scale Collocated Topology
Enterprise Edition Server with Load Balancer
Scale - 5,000 users per servers
Features
- Mission-critical Large Enterprise IM and Conferencing usage
5 - Enterprise Scale - High Scale, High Availability
Enterprise Edition Server with Load Balancer
Scale - 11+ Servers (5 roles) 50,000+ users per pool (goal)
Features
- Mission-critical Large Enterprise IM and Conferencing usage
- Optional SQL clustering
- Multiple IIS-Internet Information Servers for security
Here are some explanations of various servers:
- Access Edge Server - remote access, public IM connectivity (PIC), conferencing signaling
- Web conference Edge Server - external access to conferencing, remote/federated/anonymous user
- A/V-Audio-Video Conf Edge Server - conferences with external users, point-to-point A/V calls, voice to external UC endpoint
- Reverse Proxy - access to web services including ABS-Address Book Server
- Front End (FE) Server:
- The front end server role of OCS (or the Director) is responsible for processing and routing the call to the UM-Unified Messaging server.
- Cannot be on the same Active Directory server as the OCS server
- Can be used for SSO-Single Sign on for SIP traffic, UM, etc
- Allows for “seamless” functioning such as missed call notification, naming and priority and so forth.
- Perimeter Server (PS):
- Server or servers dedicated to authentication, security policies, etc
- ISA- Internet Security and Acceleration server is an example
- Usually multi-homed, i.e. having more than one NIC-Network Interface Card installed for outside to inside traffic direction.
- Other perimeter and Edge Server roles include Access Edge, Web Conferencing and AV Edge roles.
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