Asterisk Deployment in Large Enterprise and Cloud Solutions

1. Asterisk Deployment in
Large Enterprise and Cloud Solutions
Ali Pey
Sr. Software Eng Architect
Wed Jan 30, 2013

2. Cloud Services for Business
• eFax®
• eVoice®
• FuseMail®
• Campaigner®
• KeepItSafe®
• Onebox®
• www.j2.com
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3. Outline
• Why Asterisk?
• What can you do with Asterisk?
• Network Diagrams
• Large Enterprise and Could requirements
• *** Proxy Servers (SBCs)
• Load balancing, routing and failure detection
• Security
• NAT
• Questions?
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4. Why Asterisk? (1/3)
• It is Open Source
• It has a Community
– Numerous companies and resources
– Forums, mailing lists
– Tools
• No Cost
 Open Source is revamping telecom
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5. Why Asterisk? (2/3)
• More Independence (Not depending on a single
company)
• Continued Enhancements
– The community is growing so are the features
– Interoperability
– WebRTC
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6. Why Asterisk? (3/3)
• Flexibility, Customization and Integration
– Integrates with your back end
– Business Logic Integration
– Database Integration
– Special Features or Requirements
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7. What can you do with Asterisk? (1/3)
• Make a phone Call
• Conference, Hold, Transfer, Park,
Announcement, Click to call, and many many
more.
• Basically any Telephony Feature you can
imagine
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8. What can you do with Asterisk? (2/3)
• Connect Phones/Clients:
– Analog
– SIP Phones
– Soft phone
– Web phone
– Mobile
– WebRTC
• Trunks:
– IP (SIP)
– Digital: T1/E1
– Analog
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9. What can you do with Asterisk? (3/3)
• PBX
• Telephony and Voice Applications
• Presence and BLF
• Google Voice and WebRTC
• Conferencing, Video, Fax, Auto Attendant, etc. etc.
• The question is: What can’t you do with Asterisk?
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10. Diagram 1 - SIP Clients: SIP Phones, Soft phones,
Web Phones, Mobile or even WebRTC
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11. Diagram 2: SIP Trunks
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12. Diagram 3 - Analog/Digital Cards/Gateways
(Single point of failure)
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13. Large Enterprise and Cloud Solutions
(or simply: Bigger Systems)
• Redundancy
• High Availability (Failure Detection)
• Distribution and Routing Rules
• Performance and Reliability
• Security
• NAT Traversal
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14. Proxy Servers
What is a Proxy Server? (1/2)
• Registrar Server for Clients
• Routing, Rules, Failure Detection and Re-
Routing
• SIP Signaling, Codec and Digit Manipulation
• Load Balancing
• Scripting
• Resource Allocation
• Rate Limiting
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15. What is a Proxy Server? (2/2)
• NAT Traversal
• Media Proxy (or Direct Media Path)
• Performance
• Redundancy and High Availability
• Security and Authentication
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16. Two Asterisk Servers and One Proxy Server
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17. Two Asterisk – Two Proxy servers
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18. Fully Redundant Distributed Environment
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19. Proxy Servers (SBCs)
• Open Source vs. Commercial
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20. Open Source Proxy Servers
• OpenSIPS
• Kamailio
• OverSIP (Ruby, WebSocket)
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21. Commercial SBCs (Session Border Controller)
• Acme Packet
• Dialogic
• Audiocodes
• Sonus
• And quite a few others
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22. Fully Redundant Large Enterprise and Could
Solution
• Performance
• Redundancy
• High Availability
• Routing, Rules, Load Balancing and Distribution
• Security
• NAT Traversal
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23. Performance, Redundancy, High Availability and Distribution
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24. Call Flow Diagram Examples
• SIP Phone to SIP Phone Call
• SIP Phone to SIP Trunk Call
• SIP Trunk to SIP Trunk Call
• Analog (Trunk or Phone) to SIP Trunk Call
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25. Call Routing
• Load Balancing
• Resources
• Dynamic Routing
• Rules
• Failure detection
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26. Security
• Sooner or later
• Close network vs. Open and in between
• What to look for?
• What to examine?
• Each deployment has its own unique
characteristics that can make it safe.
• Secure VoIP – Insecure system => Call patterns
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27. NAT
• What is NAT?
• Public IP vs. Private IP
• SIP Signaling
• Media
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28. Questions?
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