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Blink is elegant, simple to use and feature-full

Blink is the best SIP client for Mac. You can use it with any SIP provider or its own fully-featured SIP service.

Blink is a fully featured and easy to use SIP client. Blink offers Rich Multimedia Communications based on SIP protocol using Future Proof Addressing in the form of an E-mail Address. Easy Integration with existing SIP Service Providers. Open Source, you get the source code and you can contribute.

Features:

Blink implements RTP audio sessions (VoIP), session based Instant Messaging (IM), file transfer and multi-party chat sessions using MSRP protocol and its relay extension, desktop sharing using VNC protocol, publication and subscription for rich presence information, management for the presence rules, resource lists and RLS services documents using XCAP protocol.

Wideband VoIP

* HD Audio (G722/Speex)
* PSTN Compatible (G711)
* Encryption (sRTP)
* NAT Traversal (ICE)
* Multi-Party Conferencing

Instant Messaging
* Chat Sessions (MSRP)
* SMS (SIP MESSAGE)
* Rich-Text, Emoticons
* Composing Indication
* Multi-Party Conferencing

File Transfer
# Exchange Files (MSRP)
# Encryption (TLS)
# Drag and Drop Photos
# Works behind NAT
# Retry Transfers

Rich Presence
* Presence (SIMPLE)
* RLS Services
* Offline Status
* Server-side Storage (XCAP)
* Buddylist Syncronization

Desktop Sharing
# Help Family Remotely
# Collaboration at Work
# Surf Internet Together
# Integrated with Audio
# Works behind NAT