ABTO SIP SDK provides a solution to quickly build VoIP softphone that can dial and receive calls on your computer or add VoIP features into your application.

Quick facts about VoIP SIP SDK for Android:

All Android versions
Support of SIP and RTP
STUN and other IETF standards (compatible with SER, OpenSER and Asterisk)
SIP Registrar (SIP server) support
Audio and video calls
Status messages

Available codecs:

G.711-ALaw
G.711-muLaw
G.729
Speex
Theora
GSM
H.263
H.263+
H.264

Скачать ABTO Software VoIP SIP SDK for Android бесплатно на странице загрузки.