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

Optus

optus.com.au

Allstream

allstream.com

Simptel

simptel.com

ShoreTel

shoretel.com

Sangoma Wholesale Carrier Services  

carrierservices.sangoma.com

Sangoma

sangoma.com

Sabsebolo

sabsebolo.com

Analytic Call Tracking

analyticcalltracking.com

RCN

ripiocredit.network

Quickblox

quickblox.com

Avaya

PanTerra

panterranetworks.com

Sunwire      

sunwire.ca

OpenCloud Rhino

opencloud.com

Ooma

ooma.com

OnSIP

onsip.com

OBihai      

obihai.com

Nucleus        

nucleus.com

NobelCom

nobelcom.com

AVOXI

avoxi.com

Net2Phone

net2phone.com

NEC Phones

necam.com

VirtualPBX

virtualpbx.com

Zaplee

zaplee.com

XPhone

xphone.com

WebRTC

webrtc.org

AgileIP

agileip.ca

Voip Unlimited  

voip-unlimited.net

VoIP Much

voipmuch.ca

VoIP.ms

voip.ms

VoIP Business

voipbusiness.com

Voiceserve

voiceserve.com

magicJack VocalTec

vocaltec.com

SpiderCom

spidercom.net

Vertical

vertical.com

Verified Call

verifiedcall.com

Unilava

unilava.com

Treasure State Internet

tsi.io

Toky

toky.co

Tango

tango.me

TalkRoute

talkroute.com

Tadiran

tadirantele.com

Mojo Dialer

mojosells.com

Digium

digium.com

Tackle   defunct

gotackle.co

Google Voice

google.com

GetVoIP

getvoip.com

G3 Telecom

g3telecom.com

Better Voice

bettervoice.com

Freeje

freeje.com

Five9

Expert Cabling

expertcabling.ca

Easylink Solutions

easylinksolutions.com

Dream Lover

dreamlover.com

Gradwell

gradwell.com

BrantTel

branttel.com

Consensus

consensus.com

Clearwave Communications

clearwave.com

Callture

callture.com

CallTrackingMetrics

calltrackingmetrics.com

CallRail

callrail.com

Callfire

callfire.com

CallCentric

callcentric.com

Calilio

calilio.com

Buckeye CableSystem

buckeyecablesystem.com

Janus Server

janus.conf.meetecho.com

BroadConnect    

broadconnect.com.au

Bandwidth  

bandwidth.com

MightyCall

mightycall.com

magicJack

magicjack.com

M2

m2.com.au

3CX

3cx.com

Linksys

linksys.com

Line2

line2.com

Jive

jive.com

Jazinga

jazinga.com

MyOperator

myoperator.co

ITP VoIP

itpvoip.com

iPlum

iplum.com

Intratel

intratel.ca

Intermedia

intermedia.net

Inteliquent

inteliquent.com

iiNet

iinet.net.au

HotTelecom

hottelecom.biz

GTalk

Grasshopper

grasshopper.com

Grandstream        

grandstream.com