Skype  

skype.com

RingCentral    

ringcentral.com

Poly           defunct

Nextiva    

nextiva.com

Mitel  

mitel.com

Vonage  

8x8  

8x8.com

FreeSWITCH    

freeswitch.org

Dialpad      

dialpad.com

Lua  

lua.org

Digitcom  

digitcom.ca

Western I.T. Group        

westernit.com

3CX

3cx.com

AgileIP

agileip.ca

Allstream

allstream.com

Analytic Call Tracking

analyticcalltracking.com

Avaya

AVOXI

avoxi.com

Bandwidth  

bandwidth.com

Better Voice

bettervoice.com

Boundary

boundary.live

BrantTel

branttel.com

BroadConnect    

broadconnect.com.au

Buckeye CableSystem

buckeyecablesystem.com

Calilio

calilio.com

CallCentric

callcentric.com

Callfire

callfire.com

CallRail

callrail.com

CallTrackingMetrics

calltrackingmetrics.com

Callture

callture.com

Clearwave Communications

clearwave.com

Consensus

consensus.com

Digium

digium.com

Dream Lover

dreamlover.com

Easylink Solutions

easylinksolutions.com

Expert Cabling

expertcabling.ca

Five9

Freeje

freeje.com

G3 Telecom

g3telecom.com

GetVoIP

getvoip.com

Google Voice

google.com

Tackle   defunct

gotackle.co

Gradwell

gradwell.com

Grandstream        

grandstream.com

Grasshopper

grasshopper.com

GTalk

HotTelecom

hottelecom.biz

iiNet

iinet.net.au

Inteliquent

inteliquent.com

Intermedia

intermedia.net

Intratel

intratel.ca

iPlum

iplum.com

ITP VoIP

itpvoip.com

Janus Server

janus.conf.meetecho.com

Jazinga

jazinga.com

Jive

jive.com

Line2

line2.com

Linksys

linksys.com

M2

m2.com.au

magicJack

magicjack.com

MightyCall

mightycall.com

Mojo Dialer

mojosells.com

MyOperator

myoperator.co

NEC Phones

necam.com

Net2Phone

net2phone.com

NobelCom

nobelcom.com

Nucleus        

nucleus.com

OBihai      

obihai.com

OnSIP

onsip.com

Ooma

ooma.com

OpenCloud Rhino

opencloud.com

Optus

optus.com.au

PanTerra

panterranetworks.com

Quickblox

quickblox.com

QUO

quo.com

RCN

ripiocredit.network

Sabsebolo

sabsebolo.com

Sangoma

sangoma.com

Sangoma Wholesale Carrier Services  

carrierservices.sangoma.com

ShoreTel

shoretel.com

Simptel

simptel.com

SpiderCom

spidercom.net

Sunwire      

sunwire.ca

Tadiran

tadirantele.com

TalkRoute

talkroute.com

Tango

tango.me

Toky

toky.co

Treasure State Internet

tsi.io

Unilava

unilava.com

Verified Call

verifiedcall.com

Vertical

vertical.com

VirtualPBX

virtualpbx.com

magicJack VocalTec

vocaltec.com

Voiceserve

voiceserve.com

VoIP Business

voipbusiness.com

VoIP.ms

voip.ms

VoIP Much

voipmuch.ca

Voip Unlimited  

voip-unlimited.net

WebRTC

webrtc.org

XPhone

xphone.com

Zaplee

zaplee.com