Functions
- Instant Messaging
- on-Premise web conferencing
- Audio/Video conferencing
- Telephony
Architecture
Editions
- Standard Edition ( small/ medium )organizations
All scenarios / Functionalities located on the server
- Enterprise Edition( medium / Big) organizations
- Consolidated configuration
All functions/Scenarios located on front end servers
- Expanded configuration
Each Function is configured on a standalone server
Servers
- Front End Servers( All functions)
- Perimeter servers
- Application servers
- Active Directory servers.
( telephony and conferencing servers have to be stand alone servers)
Telephony
Basic Telephony Components
PSTN is a network of public circuit-switched telephones across the world
ISDN PRI is a voice and data service that provides high-volume access to PSTN
A PBX
A telephony gateway
Functionality Of Telephony Solution
- Basic call control
- Advanced call control
- Inbound call options
- Call forwarding
- Voice mail












