Review of the critical role open source telecom software plays in enterprise communications for UCSummit 2020. Covering project asterisk, elastix, freepbx, freeswitch, fusionpbx, homer, kamailio, kazoo, mobicents, open sips, open source, open source telecom software, restcomm, rtpproxy, sip3, sipcapture, sippy softswitch, survey, tadsummit, telecom.

1. Open Source
Telecom Software
is the Keystone of
Our Industry

4. Industry Noise is Dominated by a Few Companies,
And Most of it is Utter B@ll@ck$
DIGITAL TRANSFORMATION
5G
US LARGE ENTERPRISE NEEDS
CLOUD
API ECONOMY
AI
RCS
UCAAS & CCAAS & CPAAS
MITEL & AVAYA
2+1.8 = 5
DIGITAL BLOODY EVERYTHING
PAY TO PLAY AWARDS
BIASED
QUADRANTS
FASHIONABLE THEORIES
INFLATED EXPECTATIONS
FALSE WARS: MESSAGING
BABS-ARTISTS

5. We’ve got a ‘Bit’ of an Unlevel Playing Field!

6. Who Am I?
Independent chartered engineer who wanders the world helping people build their
businesses, and pointing out all the BS in the telecoms / communications industry.

7. Public CPaaS
Communication Enabling Software and Platforms /
Open Source Projects
Business
Messaging
In-App Comms
Enterprise Channel (Gamma, WWT, Verizon, AT&T, etc)
Customer Communications. Contact center,
messaging, trust, ..
Programmable Telecoms/Comms Landscape
Automation Technologies (bots, speech rec, analytics, workforce management, knowledge
management, conversational interfaces, marketing automation)
© Alan Quayle 2019
Employee Communications. Unified
Comms, business telephony, phone
systems, messaging, collaboration

8. In App / Video Comms CPaaS / Messaging / Content / Payments CCaaSUCaaS
Communication Enabling Software and Platforms
Open Source Projects
© Alan Quayle 2019

9. Projects
2600Hz / Kazoo Refocused on CPaaS / UCaaS enabler with Kazoo
Asterisk (Digium/Sangoma) Leading open source telecom app server, largest community
easyRTC (Priologic Software) WebRTC toolkit suitable for building highly secure, WebRTC applications
elastix (3CX) UC wrap including Asterisk, FreePBX, HylaFAX, Openfire and Postfix.
FreePBX (Sangoma) open source GUI (graphical user interface) that controls and manages Asterisk
FusionPBX
FreeSWITCH GUI (Graphical User Interface) for PBX, carrier grade switch, call center server, fax server, voip server,
voicemail server, conference server, voice application server, appliance framework and more
HOMER (qxip) SIP Capture system and Monitoring Application
Janus (Meetecho) lightweight (written in C) WebRTC Gateway
jitsi.org (8X8) JavaScript WebRTC application and can be used for videoconferencing
Kamailio (Astipo + many more)
SIP server for building SIP services such as a SIP proxy, SIP Presence Server, SIP location server (direct competitor to
OpenSIPS)
Kurento (Twilio) WebRTC media server. Bought by Twilio, code still available.
mediasoup
Open Source WebRTC SFU for Node.js. mediasoup is a low level component to build multi-party video conferencing
applications.
Medooze SIP Video Multiconference Media Server with WebRTC support.
openSIPS (OpenSIPS Solutions) SIP proxy/server for voice, video, IM, presence (direct competitor to Kamailio)
RTPProxy (Sippy Software)
Sippy RTPproxy is a high-performance software proxy server for RTP streams that works together with OpenSIPS.
Typical scenarios where RTPproxy needs to be used are NAT traversal or network bridging
Signalwire / FreeSWITCH
Telecom application server for real-time communication, WebRTC, telecommunications, video and Voice over
Internet Protocol (VoIP)
SIP3 (SIP3) RTC and VoIP traffic monitoring & analysis
sipXcom (eZuce)
Unified communications solution. Plug & play management system. Installation and configuration is automated and
GUI based, phones from over 10 manufacturers are plug & play managed including auto-discovery, full configuration,
directory management, speed dial, BLF, and firmware management, and users are provided with a Web portal for
self-service administration.
Telestax / Restcomm Enabler transitioning from opensource project / services to cloud based enabler
VICIdial (VICIDial group) VICIdial is an enterprise class, open source, call center suite in use by many large call centers
Wazo Fork from XiVO, focused CPaaS / UCaaS enabler
WebRTC (Google + lots of others) provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs.
© Alan Quayle 2019

10. Employee Communications
UC, business telephony, phone systems Messaging and collaboration
© Alan Quayle 2019
This is not complete, limited by who I know, please let me know what I’m missing, thx.
There’s a load more providers, this is just a sample.

11. UC Market Sizing
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
2018 2019 2020 2021 2022
Enterprise Voice / UC
Total Large Small
• But wait a minute, UC market is $33B in 2021!
– Telcos, mobile PBX, list is not complete (especially smaller players), doesn’t include channel margin
– At least 50% of the UC market is up for grabs from the telcos!
• Of small players approx 80% use open source telecom software, with Asterisk/FreePBX
being the dominate projects. Average age of companies is 6.5 years old.
• For small players 50% of revenue is from cloud/hosted services – hybrid matters
• For large players 30% is from cloud/hosted because legacy revenues tend to be on-prem

12. Open Source Telecom Software Project
Survey RESULTS
The purpose of this survey is to gather across the industry people's experiences
and opinions on using Open Source Telecom Software Projects (OSPs), and share
an anonymized aggregate view of the different projects with those that
compete the survey.
Weblog that intro’ed the survey: http://alanquayle.com/2019/05/open-source-
telecom-software-project-survey/
I'm often asked to comment on the different projects, this is an attempt to
provide something more authoritative than my opinions based on who I last
talked to J

13. Which OSPs do you use?
Which OSPs do you use? Responses %
Asterisk 71 75%
FreeSWITCH 39 41%
Kamailio 41 43%
OpenSIPS 51 54%
Restcomm/Mobicents 3 3%
© Alan Quayle, 2019

14. Which OSPs do you use?
Management Interfaces / Solution
Wraps / Monitoring & Capture
Responses %
Elastix (for Asterisk) 1 1%
FreePBX (for Asterisk) 21 22%
FusionPBX (for FreeSwitch) 10 11%
Kazoo 2 2%
RTPProxy 18 19%
SIP3 0 0%
Sipcapture - Homer 31 33%
Sippy Softswitch 2 2%
VICIdial (for Asterisk) 7 7%
Wazo (for Asterisk) 15 16%
YETISwitch 0 0%
sipsak, sipp 1 1%
Note: sipsak is a CLI for testing using SIPp (Open Source test tool /
traffic generator)
© Alan Quayle, 2019
FreePBX is most popular
management interface for
Asterisk
Nice to see RTPProxy being
used, it comes up in
discussions more often.
Nice to see more niche
projects like VICIdial
(Asterisk) being used.
All these projects helps
explain the diversity of
application areas we see for
open source projects.

15. Asterisk: What is the main application(s)?
Application (66 responses) Responses %
PBX 50 76%
Conferencing 28 42%
Contact Center 37 56%
Mobile App Comms 6 9%
CPaaS 4 6%
UCaaS 7 11%
CCaaS 0 0%
Video CC 0 0%
Media App Server 6 9%
Scale (66 responses) Responses %
100 22 33%
1000 12 18%
10k 25 38%
100k 11 17%
1M+ 3 5%
© Alan Quayle, 2019
The “popular” view: Asterisk is used for PBX implementations at enterprise scale.
This provides some quantification on the breadth and scale of Asterisk applications.

16. Standing on the
Shoulders of Giants..
Bernard of Chartres in 12C
Isaac Newton in 1675
..we can focus on the customer

17. Useful Links
Deeper Dive into the Open Source Telecom Software Project Survey
http://alanquayle.com/2019/12/deeper-dive-into-the-open-source-telecom-
projects/
TADSummit EMEA
http://blog.tadsummit.com/2019/11/22/tadsummit-emea-2019-summary/
TADSummit Americas
http://blog.tadsummit.com/2019/10/17/tadsummit-americas-2019-summary/
TADHack: tadhack.com and blog.tadhack.com