VOIP with SIP PBX solution , help me about clients ?
 

i use SIPFOUNDY server for management IP phone, and when i chose soft phone client (for Windows) examples : SIPXPHONE ,sipXezPhone and sipXtapi.... quality of voice is very bad , could i chose the best softphone? pls send 2 me, thanks alot

I think the counterpath phone is good
 

There is a free lite version that is nice to look at and works well through nat.
http://www.counterpath.com/

PS. I'd also recommend running the adminsparadise voip pbx
it runs asterisk -- so it can support both sip and iax based phones and with some tweaking h323.

It also has a great web based fax server

later