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AbtoVoIPClient

Free
iPhone / iPad
Genres:
  • Business
  • Utilities
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ABTO Software's VoIP SIP softphone.
Can be used to call sip numbers and landline numbers if sip provider has this option.

Features:
voice calls;
video calls;
several lines;
text chat (depending on sip server);
status update (presence);
DTMF support;
works with most SIP servers, including Asterisk;
works great with most sip clients including VoIP SIP SDK for Windows;
IPv4 and IPv6 support.