OnSIP
PortSIP Softphone
PortSIP
Linphone
Belledonne communications
Sipnetic
IPTON
Bria - VoIP SIP ソフトフォン
CounterPath Corp
Skype
jiPBX - SIP VOIP Softphone
jiWeb Technologies LLP
MobileVOIP international calls
Finarea
Google Voice
Google LLC
Bria Mobile : VoIP 電話 ソフトフォン