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AstriDevCon 2015 was held at the Loews Royal Pacific Resort on Tuesday, October 13th, 2015. Participants gathered to discuss the state of the Asterisk project, ideas for improvements, and to coordinate development efforts.

In addition, four participants presented on topics interesting to their usage of Asterisk. Those four were:

  • Sean McCord of Cycore Systems
  • Lorenzo Emilitri of Loway
  • Ben Klang of Mojo Lingo
  • Torrey Searle of Voxbone

Lunch was provided by Bluehost, who once again sponsored this event. Much thanks to the speakers and sponsor!



I often misspell names while I'm taking them at the start of AstriDevCon. If you see your name here and it is typed incorrectly, please comment on the bottom of the page and we'll get it fixed up quickly. The same goes for your organization as well.

If you were in attendance at AstriDevCon and I don't have you on the list, please also comment and we'll make sure you're noted.

Name Organization
Matt Jordan Digium
Mark Michelson Digium
Malcolm Davenport Digium
Joshua Colp Digium
Scott Griepentrog Digium
Kyle Kurz Digium
Dan Jenkins Nimble Ape
Andy Smith Truphone
James Body Truphone
Tim Panton Himself
Corey Farrell Raynet Technologies
Jason Parker Sangoma
Rob Thomas Sangoma
Lorenzo Emilitri Loway
Marco Signorini Loway
Sylvain Boily Xivo
Clod Patry TelcoBridges
Daniel Collins USAN
Steve Sokol Digium
Carlos Medina Sangoma
Andrew Nagy Sangoma
Bryan Walters Sangoma
David Duffett Digium
Perry Ismangil Teluu
Nanang Izzuddin Teluu
Ahmad ITConsultant
Alan Graham Thinking Phones
Bradley Watkins Avoxi
Michael Swann Connection Telecom
Steve Davies Connection Telecom
Florian Buzin Starface
Daniel-Constantin Mierla Kamailio/Asipto
Vincent Morsiani Voxbone
Torrey Searle Voxbone
Philippe Lindheimer Sangoma
Sean McCord CyCore Systems
James Cloos Consultant
James Finstrom Sangoma
Kevin McCoy QLOOG
Nir Simionovich Greenfield Technologies
Arik Halperin Greenfield Technologies
Or Polaczek Greenfield Technologies
Eric Klein Greenfield Technologies
Keith Hunt Mojo Lingo
Ben Klang Mojo Lingo
Leif Madsen Avoxi
Darren Sessions Avoxi
Jared Smith Bluehost
Brian West FreeSWITCH Solutions


Recap of 2015

  • unknown user gave a brief recap of the development work that occurred in 2015 (see AstriDevCon Recap.pdf).
  • Three major goals were outlined from last year's DevCon:
    • Move the project to Git
    • Improve the documentation
    • Improvements to Asterisk as a media application server
  • Move the project to Git
    • This was (relatively) completed:
    • Some things that still need to be done:
      • Some tweaks to the CI infrastructure still need to be done, including unknown user's ref leak tests. Note: all Zuul/Jenkins jobs are open source in the infrastructure repo, and can be submitted for review to Gerrit
      • There's clearly a bit of a learning curve with Gerrit. Some education on its usage would be useful.
        • unknown user did a demo of submitting a patch at the end of DevCon, but others remarked that was still a bit daunting.
  • Improve Documentation
  • Asterisk as a media application server
    • New events:
    • channels resource additions:

      • The originate operation now lets you specify an originator for linkedid propagation
      • The channel data model now includes the language field for the Asterisk channel it represents
      • The originate operation and continue operation now let you specify a priority label
      • The redirect operation was added, allowing channels to be transferred or forwarded to external systems
      • Module manipulation can now be done via /asterisk/modules:
      • Log channel manipulation can now be done via /asterisk/logging:
      • Push configuration for Sorcery backed modules. This was designed specifically for use with the PJSIP stack. Using ARI, PJSIP objects can be pushed into Asterisk and backed by one of the pluggable sorcery backends. See ARI Push Configuration for an example of using this.
        • events resource additions:
      • When establishing a WebSocket connection, you can now subscribe to all events happening in Asterisk using the subscribeAll query option.
        • applications resource additions:
      • When subscribing to an event resource, not providing any specific resource name will now subscribe you to all events for that resource type. Note that the specific resource names are now optional for all resource types. Presentations

Sean McCord

!!! note Where is Sean's Presentation? Sean, in a fit of daring, presented completely without slides. Impressive!

  • Sean has now migrated/rewritten several systems that previously used AMI and AGI with Asterisk 11 to Asterisk 13, ARI, Go, and Docker
    • As an aside, with ARI, there are pros/cons to using a statically typed language such as Go. The more dynamic languages (JavaScript, Python, etc.) can auto-generate bindings more easily. On the other hand, static typed languages can make development more predictable, eliminating some classes of errors. It's a tradeoff.
  • Asterisk 13 with ARI feels somewhat like the intent of Asterisk SCF. True, it doesn't have some of the interesting scalability features of Asterisk SCF, but pulling the application logic out of Asterisk makes it scale more easily, and the API presented by ARI is nice.
  • Things that could be better in ARI:
    • Documentation still needs work. The "first level" of documentation is okay, the "second level" needs improvement. Some documentation is confusing. Specific examples:
      • Media URIs in ARI are not always documented consistently
      • Body and path parameters both have IDs, and when to use body versus path is not always clear
    • As a C developer, adding features to ARI is not clear. Unlike AMI, or dialplan applications, where there were clear registration functions, ARI is more "tightly coupled" with the system. This may also be a documentation issue.
    • When a WebSocket connection is broken, channels 'hang around' in the Stasis dialplan application, and new channels can enter - albeit with a warning. Some way to more gracefully handle this scenario would be good.
    • Arbitrary tone detection is desirable. DTMF is great, but getting an event when a particular DSP specific frequency is triggered would be neat.
  • Docker
    • Docker has lots of benefits when used with Asterisk (see open discussion notes below). However, there are some issues.
    • Docker networking sucks. Asterisk uses a lot of ports; having to open up large ranges is never fun.
    • Lots of third party docker files, most suck (but that's okay). Maybe we can improve upon this by adding a docker file to the source tree as a basis?
  • Asterisk logging options could be improved upon (see open discussion notes below).

As a result of Sean's presentation, a large number of discussions occurred on a variety of topics. Since these ranged across a broad spectrum and were added to as the day progressed, those topics are documented in the open discussion section below.

Lorenzo Emilitri

Ben Klang

BenKlang_AstriDevCon 2015.pdf

Torrey Searle

Open Discussion

  • Docker
    • The networking system is now pluggable.
      • Sean: Not many good implementations yet.
      • Lenz: Lots of traction with Docker, will probably just be improved in the future.
      • Sylvain: Docker 1.9 contains a new system.
    • Sean: Docker image format is stable; what has changed is breaking things out and making it more modular
      • Doesn't feel like a moving target; really, does it provide what a VoIP application needs?
    • Motivations:
      • CoreOS stack/scaling
      • Immutable infrastructure/testing
      • Microservices
      • Orchestration
      • Easier to build than RPMs
  • Packaging
    • In a Docker world, how much do we care about packages?
    • Community people typically just do it, as opposed to the projects
    • Leif: packages are still required
      • Every run command adds a layer of information to the image
      • Packages let you flatten things a bit in the image
    • James: lots of systems means you need packages
    • Ben: source packages are very helpful
    • Should we have a common docker file in Asterisk?
      • Leif: we can probably figure that out
      • Corey: How about just having a .spec file?
      • should be related to that .spec file
  • Configuration
    • Would be nice if Asterisk played better in a cluster environment
    • Steve: How much configuration is doable from ARI?
      • Not much. Just sorcery.
      • Rob: I hate the idea.
      • Mark M: Can we just use more sorcery?
      • Darren: I'd +1 that
      • Darren: You're at a different level if you're doing this
      • Steve: GUI or API is the way things are done today.
      • Corey: Be careful which configs we can do via ARI
  • ARI
    • How many others have attempted to add things to ARI?
      • Darren: TTS.
    • Lenz: People are still trying to wrap their heads around ARI.
      • I'd like to offer a Docker image that you can run an ARI hello world in
      • Goal: Have an Asterisk image that people can load up and use
      • Daniel: How about VirtualBox?
      • Could be anything, so long as it is easy to setup, deploy, and throw away
  • Video
    • Ben/Dan: Don't reinvent the wheel
    • Farm out to FreeSWITCH or Jitsi videobridge
    • Should we farm out? Makes it harder for users
      • Darren: we already do that. TTS, ASR, etc.
    • Steve: so we're a telephony engine. What do we want to be?
      • Where is this headed? Is it WebRTC?
      • Asterisk disrupts the PBX world
    • Lenz: Video is just part of telephony
    • Ben: Asterisk is an infrastructure piece.
    • Daniel: WebRTC brings more security stuff, which is good
      • Codecs.
      • Hardware/telephony manufacturers: SRTP
    • Dan Jenkins: Opus.
    • Steve: microservices are the way other people are approaching the problem, as opposed to the traditional model of SMB PBX
  • Documentation
    • Hard to find, probably exists
  • Codec negotation improvements
    • Reduce eliminate transcoding on the fly
  • Asterisk as a piece of Infrastructure
    • Logging
      • Dan: grok filter, file input
      • Sean: Asterisk console output + wrapper
        • stdout is flexible
        • UDP port with JSON is easiest
      • Brad: logstash monitor
        • loggly
        • sumo logic
    • Horizontal scalability
      • Torrey: How can we roll out Asterisk faster? Can we run multiple versions on the same box?
        • Docker
        • CLI commands/APIs to tell Asterisk to stop/start listening
      • Leif: Discovery is an issue
        • Rob: UPnP
        • etcd (CoreOS)
        • consul
        • SRV records
        • Leif: attach metadata about what an instance is capable of doing
      • Daniel: Also have to worry about authentication/authorization
        • Discovery is a part
      • Corey: Custom module to run a script on startup
  • Swagger versioning
    • It'd be nice if it was one version
    • Sean Bright was working on this Conclusions ===========