22Call SIP - 基于SIP的一款拨号器 app for iPhone and iPad

22Call SIP是一款供您日常业务沟通之用的网络电话，无论您身在何处，均可保持连接。它是一种独立网络电话订阅，而不是一项VoIP服务。不妨免费试用14天！如果在试用期内取消，则不会收取任何费用。拨打电话需要一台SIP服务器，或向基于SIP的VoIP提供商进行订购。如果您需要技术支持，或者需要合作可以随时联系我们。

22Call SIP is an Internet phone for your daily business communication, you can stay connected no matter where you are. It is an independent VoIP subscription, not a VoIP service. Try it free for 14 days! If you cancel within the trial period, no fee will be charged. A SIP server is required to make a call, or order from a SIP-based VoIP provider. If you need technical support, or need cooperation, you can contact us at any time.