What is the best software on xp to connect to a PABX for VOIP?

I like X-lite from CounterPath. They have free and paid versions so check it out. Simple to use and have clients for most platforms too.

Try Asterisk! Its opensource and it even allows you to connect to different telephone service like PSTN or VOiP. Few of it's features are: virtual PBX logging, voicemail, phone menus, etc.It is ported to different OS like Linux, Unix, Mac and Windows (AsteriskWin32).

Try this office phone systems softwares: FreeSWITCH, FreeSentral, OpenPBX, Bayonne, etc.

The best PABX for VoIP or office phone systems for Windows is nothing but AsteriskWin32.

Try getting a VoIP phone service from decent providers.

There are many open source PBX platform software that you can use to have a flexible office phone system service: Asterisk, PBX in a Flash, etc.

RingCentral works to any kind of phone at any platform. Therefore any existing system can be integrated with ringcentral services.

If you want an open-source office phone system then search Windows ported AsteriskWin23.

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