Apps like Sunrise Cloud PBX

Here are some great alternatives to Sunrise Cloud PBX by Sunrise GmbH :
Medtel Cloud
Medtel Cloud
★3.8
ConnectUC
ConnectUC
★3.8
AT&T Office@Hand
AT&T Office@Hand
★3.4
MTT Business — IP phone
MTT Business — IP phone
★3.6
TeleGo
TeleGo
★4.6
gTalk PBX
gTalk PBX
★4.5
JustCall - Cloud Phone System
JustCall - Cloud Phone System
★3.6
Smart Second Phone Line for Bu
Smart Second Phone Line for Bu
★3.5
NHC Mobile
NHC Mobile
★3.6
Telzio
Telzio
★3.7
Yeastar Linkus Mobile Client
Yeastar Linkus Mobile Client
★3.9
Monmouth Telecom
Monmouth Telecom
★3.3
FSN 2GO
FSN 2GO
★4.4
Davinci Virtual
Davinci Virtual
★4.3
iTeleCenter
iTeleCenter
★4.2
OneCloud
OneCloud
★4.1