Hosted VoIP Services using Erlang/OTP

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Hosted VoIP Services using Erlang/OTP

• VoIP meets the Cloud

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Where is the Cloud Going

• Hardware
• Clustering
• Commodity Hardware
• Software
• Abstraction of application layer from hardware
  infrastructure
• Web 2.0 Long Polling
• 24/7 services always on, on demand
• Shorten Product Cycles
• Easy languages

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Cloud coding Tougher than expected

• Geometrical Complexity
• Concurrency management
• State management
• Latency tuning
• httpd scaling
• Updating code is a chore

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Problems? What problems?

• Deadlocks
• Shared memory corruption
• Unreliable code updates (at best)
• Synchronous httpd requests
• Debugging
• Replication
• (and I havent even started)

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Erlang Overview

• Joe Armstrong
• Designed for
• concurrency
• distributed systems
• error containment
• fault tolerance
• hot code loading
• Ericsson switches 99.9999999 uptime (31ms/yr)

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Designed for Concurrency

• Basic unit of concurrency is a process
• Really light-weight (300 bytes)
• Not really a kernel process
• No shared memory with other processes
• No differentiation between Local and Remote
  messages
• Polymorphism through pattern matching
• Native multi-master database
• Runtime environment

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Erlang in the wild
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Case Study - Aptela

• Positioned to deliver unified intelligent
  communications (voice, data, video) to small and
  medium businesses.
• Launched on-demand PBX Software in 2001,
  transforming to Voice as a Service in 2005.
• SaaS delivery of integrated hosted applications
  and nationwide VoIP telephony infrastructure.
• Dynamic, growing customer base of 2800 companies
  completing over 20 million transactions per month.

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Why switch to Erlang/OTP?

• Concurrency management
• State management
• Faster Developer Ramp-up
• Easier code management deployment
• Capacity tailing
• The roving bottleneck
• Fault tolerance

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And?

• Development gains Product Mgrs like the devs
• Exposing features versus developing features
• Components scale near-linearly
• Uptime is not a four-letter word
• Significant performance gains!

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Enabling Integration