From Heiko Sommerfeldt:
Phoner Portable is a free softphone for ISDN and VoIP telephony. An answering machine and text-to-speech support complete the large package. It uses SIP and is fully compatible with all VoIP providers and supports a lot of supplementary services.
What's new in this version:
Version 2.82 has fixed wrong internal IP address for UPnP requests.