Specifications

ShoreTel Architecture Call Control
1
ShoreTel 14 Maintenance Guide 20
Figure 3: SIP, SIPS, and MGCP in a ShoreTel System
ShoreTel’s Enhanced SIP Call Control
Call control between ShoreTel switches is based on Session Initiation Protocol (SIP), an application-
layer protocol defined by IETF for voice-over-IP applications. Independent of the packet level, SIP
establishes, modifies, or terminates sessions without respect to media content. Because of its
extensibility and advanced integration capabilities, SIP is considered the protocol standard for real-
time communications.
= Secure SIP (SIPS)
= Enhanced SIP
Legend
Headquarters Site
Regional Site
Small Office / Home office
Teleworkers
= MGCP
ShoreTel Service
Appliances
ShoreTel Voice Switch
ShoreTel Voice Switch
ShoreTel Voice Switch
ShoreTel Voice Switch
ShoreTel Voice Switch
ShoreTel Voice Switch
ShoreTel Voice Switch
Soft
Phone
OR
IP Phone
IP PhoneIP Phone
Analog PhoneIP Phone
Soft
Phone
IP PhoneIP Phone
Analog PhoneAnalog Phone
ShoreTel
Director
Desktop/
Browser
Clients
Desktop/
Browser
Clients
Desktop/
Browser
Clients
Desktop/
Browser
Clients
Desktop/
Browser
Clients
DRS
CAS/IPDS
Voicemail
Media Driver System
Softswitch
TMS/DTAS
Remote Server
DRS
CAS/IPDS
Voicemail
Media Driver System
Softswitch
TMS/DTAS
Remote Server
Media Driver System
Voicemail
Distributed Routing
Service (DRS)
Client Application Server
(CAS)/IPDS
Internet Information Server
(IIS)
Softswitch
Monitoring Service
CDR
Database
Monitoring
Database
Configuration
Database
Data Services
Telephony Management
Service (TMS)/Distributed
Telephony Application
Service (DTAS)
HQ Server