Zoiper - Free VoIP SIP softphone dialer with voice, video and instant messaging :: Zoiper
3CXのソフトフォンは、Windows対応VoIPソフトフォンです。
Acrobits Softphone: バックグラウンド起動中でなくてもプッシュ着信可能！050番号用電話クライアント。 | AppBank
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SessionTalk SIP Softphone by SessionTalk Ltd (iOS, 日本) - SearchMan アプリマーケットデータ
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IP Phone - SIP softphone for Windows
20 FREE SIP Softphones - VoIP Insider
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MicroSIP - lightweight VoIP SIP softphone for Windows - Official Homepage
GitHub - soramimi/qSIP: VoIP/SIP client (softphone)
CallOne VoIP Softphone - Microsoft Edge Addons
Windows PC Softphone | SIP Softphone | PC App | TeleTalkApps
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Free VoIP smartphone app for Android, iPhone, PC, Mac, Linux, WinPhone -XeloQ
