What's a good softphone for windows?

Question

I'm looking for a good soft-phone featuring the following :

• integration with exchange :
  • possibility to search exchange contacts
  • ability to quickly add the caller to a new or existing contact
• ability to handle multiple SIP accounts :
  • conference call, etc
  • the identity of the caller AND of the callee (ie SIP account) is obvious
• and of course all the small featuresmost softphone seems to have (call history, etc...)

There's a comparison list on wikipedia but it's quite difficult to figure out which one is the best ....

Answer 1

I tried X lite and it was hard to setup.

Here's some info from Wiki on SIP Software

EDIT: Just installed the 3CX Phone and it was easy to install in our network.

Answer 2

meet the Big Daddy:

Asterisk is the world's leading open source PBXi, telephony engine, and telephony applications toolkit. Offering flexibility unheard of in the world of proprietary communications, Asterisk empowers developers and integrators to create advanced communication solutions...for free.

you may also want to have a look at this:

Adomo Connects Asterisk PBX and Microsoft Exchange

Answer 3

I like XLite although it was alittle tricky to get working