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Chapter 2: ShoreTel Architecture ShoreTel Distributed IP Voice Architecture
ShoreTel Maintenance Guide 5
2.2.1 Distributed Applications Platform
The ShoreTel system's ability to support applications on distributed servers across the
enterprise while maintaining a single, cohesive system depends on the ShoreWare
Telephony Management Service (TMS) and the ShoreWare Distributed Telephony
Application Service (DTAS).
TMS runs on each ShoreWare server and observes all call activity for the SoftSwitch and
ShoreGear voice switches it manages. DTAS also runs on each ShoreWare server and directs
requests to the appropriate TMS. By putting a server at the same site as the users,
applications such as voice mail and the Personal Call Manager can run regardless of the
network availability to the Headquarters server. In addition, by hosting applications,
services, and APIs on multiple ShoreWare servers, the system can scale as necessary by
adding ShoreWare servers.
The ShoreWare TMS/DTAS software exposes a Telephony Application Programming
Interface (TAPI) for call control, and a TAPI WAV interface for media playing and
recording. These open APIs allow value-added applications to be added to the ShoreTel
system to provide voice services.
Even when there are multiple application servers, the ShoreTel system is still managed and
behaves as a single image system with complete feature transparency between sites.
2.2.2 Distributed Call Control
Distributed call control is a key concept of the ShoreTel system. Based on the industry-
standard SIP protocol, ShoreTel’s distributed call control software runs on every ShoreGear
voice switch in the ShoreTel system. Each switch call control element manages the call
setup and teardown, including features such as transferring, conferencing, and forwarding
calls, using call permissions, and call routing for the endpoints that it supports (both
analog and IP).
The voice switches communicate on a peer-to-peer basis, eliminating any single point of
failure. For instance, if one ShoreGear voice switch goes offline, all other ShoreGear voice
switches continue operating. When the voice switch comes back online, it rejoins the voice
network with no impact on system operation. There is no server involved with the basic
telephony, so the system delivers levels of availability unmatched by even legacy vendors.
Figure 2-2 The Distributed IP Voice Architecture of the ShoreTel 8 System
Open API Layer
Open
Applications
Voice Endpoints
Integrated
Applications
Open Third-Party
Applications
Open Protocol Layer
Distributed Applications Platform
Single System
Management
Distributed Call Control
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