AbtoVoIPClient app for iPhone and iPad

4.6 ( 9536 ratings )

Business Utilities
Developer: Sviatoslav Volodymyruvych Litynsky Private Enterpreneur

Free

Current version: 3.7, last update: 8 years ago
First release : 12 Sep 2012
App size: 17.52 Mb

ABTO Softwares VoIP SIP softphone.
Can be used to call sip numbers and landline numbers (if sip provider has this option).

Features:
voice calls;
video calls;
text chat (based on SIP MESSAGE request);
works with all popual SIP servers, including Asterisk/FreeSwitch;
make direct calls between clients without SIP server;
allows to use UDP/TCP/TLS protocols for SIP transport;
ability to make secure calls using SRTP/ZRTP;
supports STUN/ICE;
IPv6 support.