Sipdroid

Sipdroid was a free and open-source Voice over Internet Protocol (VoIP) client for Android operating systems. It enabled users to make and receive voice calls using the Session Initiation Protocol (SIP) standard over Wi-Fi or mobile data networks.

Features:

Sipdroid provided a range of features typically associated with SIP clients, including:

• SIP Account Support: Ability to configure multiple SIP accounts from different VoIP providers.
• Call Management: Functionality for placing, receiving, holding, transferring, and muting calls.
• Codec Support: Support for various audio codecs to optimize call quality and bandwidth usage. Common codecs included GSM, G.711 (a-law and μ-law), and Speex.
• DTMF Support: Transmission of Dual-Tone Multi-Frequency (DTMF) signals for interacting with automated systems.
• Echo Cancellation: Built-in echo cancellation to improve call clarity.
• Integration with Android Contacts: Access and use of the device's contact list for making calls.
• Encryption: Support for encryption protocols such as TLS/SRTP for secure communication.

History and Development:

Sipdroid was initially developed and maintained as an independent open-source project. While it was once a popular choice for VoIP on Android, its development has largely ceased, and it may not be compatible with newer versions of the Android operating system. Users seeking VoIP solutions on Android should consider actively maintained alternatives.

Alternatives:

Many actively maintained VoIP clients are available for Android, offering similar functionality and often incorporating newer features and security updates. These alternatives should be considered as replacements for Sipdroid due to its lack of ongoing development.