Telephone - new SIP client for Mac
When you enter a name or phone number, a system-wide address book is searched (which, by the way, can be synchronized by regular means between several computers and an iPhone). The search result is visible.

Phone call.

Settings





Supported Codecs:
- G.711 family (PCMA, PCMU);
- Speex / 8000 (narrowband);
- Speex / 16000 (wideband);
- Speex / 32000 (ultra-wideband);
- iLBC;
- GSM
- L16.
DTMF sending works, Russian and English interfaces are available. System Requirements: Mac OS X 10.5 Leopard on Intel platform.
Project site .
UPDATE
Added PowerPC support.