A good softphone for OS X

Question

I'm sorting out a VOIP setup for the office that I work in (there's about 50 people, mostly macs), and I'm looking for a good SIP softphone that would work with an Asterisk based PBX, and I figured others might be looking for something like this too.

I'm after the usual staples:

• handling multiple sip accounts
• conference calling
• caller id
• ldap/address book integration
• uses SIP

It looks like Counterpath's x-lite softphones are the most popular choices, but I've also seen Telephone, which is free, but fairly light on features.

What do you guys use?

Answer 1

sipgate.com Used it for a few years.

I was looking at changing over to something like OpenVBX