Asterisk

Asterisk™ Features
Asterisk™ based telephony solutions offer a rich and flexible feature set. Asterisk™ offers both classical PBX functionality and advanced features, and interoperates with traditional standards-based telephony systems and Voice over IP systems. Asterisk™ offers the features one would expect of a large proprietary PBX system such as Voicemail, Conference Bridging, Call Queuing, and Call Detail Records.

Telephony Services:

• Voicemail System
  • Password Protected
  • Separate Away and Unavailable Messages
  • Default or Custom Messages
  • Multiple Mail Folders
  • Web Interface for Voicemail Checking
  • E-mail notification of Voicemail
  • Voicemail Forwarding
  • Visual Message Waiting Indicator
  • Message Waiting Stutter Dialtone
• Auto Attendant
• Interactive Voice Response
• Overhead Paging
• Flexible Extension Logic
  • Multiple Line Extensions
  • Multi-Layered Access Control
  • Direct Inward System Access
• Directory Listing
• Conference Bridging
  • Unlimited Conference Rooms
  • Access Control
• Call Queuing
• ADSI Menu System
  • Support for Advanced Telephony Features
  • PBX Driven Visual Menu Systems
  • Visual Notification of Voicemail
• Call Detail Records
• Local Call Agents
• Remote Call Agents
• Protocol Bridging
  • Provides seamless integration of technologies
  • Offers a unified set of services to users regardless of connection type
  • Allows interoperability of VoIP systems

Call Features:

• Music on Hold
• Music on Transfer
  • Flexible mp3 based system
  • Volume Control
  • Random Play
  • Linear Play
• Call Waiting
• Caller ID
• Caller ID Blocking
• Caller ID on Call Waiting
• Call Forward on Busy
• Call Forward on No Answer
• Call Forward Variable
• Call Transfer
• Call Parking
• Call Retrieval
• Remote Call Pickup
• Do Not Disturb

Scalability:

• TDMoE
  • Allows Direct Connection of Asterisk PBX
  • Offers Zero Latency
  • Uses Commodity Ethernet Hardware

• Voice over IP
  • Allows for Integration of Physically Separate Installations
  • Uses commonly deployed data connections
  • Allows a unified dialplan across multiple offices

Voice over IP Interoperability:

Asterisk™ provides transparent bridging between Voice over IP protocols and traditional telephony equipment. In addition, Asterisk can transfer calls from one system to another via the Inter-Asterisk™ eXchange (IAX™) protocol.

• Inter-Asterisk™ eXchange (IAX™)
• H.323
• Session Initiation Protocol (SIP)
• Media Gateway Control Protocol (MGCP)

Traditional Telephony Interoperability

• Robbed Bit Signaling Types
  • FXS and FXO
  • Loopstart
  • Groundstart
  • Kewlstart
  • E&M
  • E&M Wink
  • Feature Group D
• PRI Protocols
  • 4ESS
  • Lucent 5E
  • DMS100
  • National ISDN2
  • EuroISDN
  • BRI (ISDN4Linux)

Codec Support

• GSM
• G.729 (available through purchase of commercial license(s))
• G.723.1 (pass through)
• Linear
• Mu-Law
• A-Law
• ADPCM
• G.726
• ILBC
• LPC-10
• MP3 (decode only)

Fax Support

• The current state of fax support is incomplete.