Sipnetic

Sipnetic is a communication application that allows users to make voice and video calls over the internet. However, it is important to note that Sipnetic does not offer its own VoIP service. Instead, users must have an account with a SIP service provider in order to use the app. This means that users must already have a server address, login, and password from their chosen provider before using Sipnetic.

The app is compatible with all standards-compliant VoIP providers and PBXes, making it a versatile option for users. It also supports calling over 3G/4G and Wi-Fi, allowing for flexibility in communication. Sipnetic has a modern user interface, making it easy and intuitive to use. Additionally, the app boasts great audio quality thanks to the use of the Wideband Opus codec. It also supports legacy codecs such as G.722, G.711, G.729, Speex, and GSM.

Sipnetic offers various features to enhance the user's calling experience. These include acoustic echo cancellation and automatic gain control, which help to improve audio quality. The app also allows for video calls using H.264 and VP8 codecs, although this feature is only available as a premium option. To ensure smooth communication, Sipnetic supports various NAT traversal techniques, including STUN, TURN, and ICE.

In addition to voice and video calls, Sipnetic also offers instant messaging with text and voice chat capabilities. The app prioritizes security, offering secure calls based on TLS, SRTP, and ZRTP protocols. Chat messages are also end-to-end encrypted using the OTRv3 protocol. These security features are available as a premium option. Sipnetic also integrates with system contacts and supports presence information based on the SIMPLE protocol suite.

The app allows for multiple SIP accounts and has the ability to quickly configure an account by scanning a QR code. It also offers advanced telephony features such as call waiting, placing calls on hold, attended transfer, sending DTMF digits, number rewriting, and voicemail message waiting indication. For users with low-bandwidth connections, Sipnetic offers an experimental Walkie-Talkie mode.

Sipnetic is available in multiple languages, including English, Dutch, French, German, Portuguese, Russian, and Ukrainian. It also offers eight different UI color themes for customization. The app does not have any ads, does not track user activity, and does not collect personal data. However, it is important to note that the video call experience may vary depending on the device and firmware capabilities, and Android 7.0 or higher is recommended for optimal performance.