- SMS when supported by server.
- SMS and IM chat integrated with OS X address book.
- Presence showing users online/offline.
- Presence status switching.
- Privacy, block users from messaging/calling and viewing online status.
- Port auto discovery - supports networks where SIP is blocked.
- Open iSoftPhone from Growl Notification.

New Features:
- Dock icon indicate missed calls.
- Prompt before quitting (when using Cmd+Q).

Bugs Fixes:
- Crash under osx 10.4 when calling from iSP Address Book.
- Problem answering multiple incoming calls, when logged to a server with several accounts.
- Problem with sip.mujtelefon.cz fixed.
- Problem with sip.mcm.net.mx fixed.

What's new in iSoftPhone 2.1?

New Features:
- Dial Prefix to access external numbers from local PABX.
- Improved Conference calling.

Enhancements:
- Recoded VoIP engine to improve performance.

Bugs Fixes:
- Fixed bug for audio device being dropped.
- Minor bug fixes based on crash reports.

New Features:
- Call Recording.
- Pop-up dial window for multiple contact numbers.
- Search for string automatically in address book.

Enhancements:
- Sip Trace log limited in size to enhance performance.
- Refreshed interface.
- Default settings used in 'My Sip Account'.

Bugs Fixes:
- Additional support for non
-standard provider configurations.
- NAT Traversal improvements.

New Features:
- Leopard Compatible.
- Call Transferring.
- Local SIP port can be set by a user.
- CRM Integration with Daylite featuring two-way support (dialing from DayLite and looking for incoming numbers in DayLite (DayLite must be launched)).

Enhancements:
- Conference Call improvement (when callers are on different SIP servers).
- Refreshed interface.

Bugs Fixes:
- Hangs during starting up are fixed.
- Some problems during connections fixed.

New Features:
- P2P + Bonjour.
- DTMF sound/info support
- Sleep/Wakeup Support

Enhancements:
- Tooltips for Address Book and Last Calls.
- Quick start after application launch.
- Incoming number is now properly assigned to entries in the Address Book.
- Incoming voice quality standard improved for some servers (freephonie.net).

Bug Fixes:
- Bluetooth device caused occasional hang-up - fixed.
- Presence bug fixed - sometimes contacts were not shown as being 'online' in the Address Book.
- Duration of a call in the Last Calls sometimes had the wrong value - fixed.
- For some servers (sipgate.de) iSoftPhone couldn't receive calls - bug fixed.