Apps like VoIPstudio

Here are some great alternatives to VoIPstudio by Level 7 Systems :
Groundwire: VoIP SIP Softphone
Groundwire: VoIP SIP Softphone
★3.4
AGEphone
AGEphone
★5.0
MizuDroid SIP VOIP Softphone
MizuDroid SIP VOIP Softphone
★4.0
SessionTalk Softphone
SessionTalk Softphone
★3.6
Acrobits: VoIP SIP Softphone
Acrobits: VoIP SIP Softphone
★3.5
SessionTalk Pro Softphone
SessionTalk Pro Softphone
★3.2
Zoiper IAX SIP VOIP Softphone
Zoiper IAX SIP VOIP Softphone
★4.4
Bria Mobile: VoIP Softphone
Bria Mobile: VoIP Softphone
★4.1
Bria Enterprise
Bria Enterprise
★4.3
MoSIP Mobile Dialer
MoSIP Mobile Dialer
★3.8
jiPBX - SIP VOIP Softphone
jiPBX - SIP VOIP Softphone
★4.2
SessionCloud SIP Softphone
SessionCloud SIP Softphone
★3.6
REDCOM Sigma Client
REDCOM Sigma Client
★4.4
VirtualPBX Softphone
VirtualPBX Softphone
★3.8
Cymbus (Legacy)
Cymbus (Legacy)
★4.3
Voiply Mobile: Calls & Text
Voiply Mobile: Calls & Text
★3.8