Apps like MTT Business — IP phone

Here are some great alternatives to MTT Business — IP phone by АО «МТТ» :
Ringotel
Ringotel
★4.0
gTalk PBX
gTalk PBX
★4.5
TeleGo
TeleGo
★4.6
ConnectUC
ConnectUC
★3.9
ePhoneGo2
ePhoneGo2
★3.8
Medtel Cloud
Medtel Cloud
★3.8
Zadarma
Zadarma
★3.2
AT&T Office@Hand
AT&T Office@Hand
★3.4
Chatwork - Business Chat App
Chatwork - Business Chat App
★3.4
magicJack for BUSINESS
magicJack for BUSINESS
★4.0
Telzio
Telzio
★3.7
Unity-Mobile
Unity-Mobile
★3.6
Yeastar Linkus Mobile Client
Yeastar Linkus Mobile Client
★3.9
Onoff Business
Onoff Business
★3.5
RCN Business Office Mobility
RCN Business Office Mobility
★4.3
T-Mobile MultiLine
T-Mobile MultiLine
★3.5