However, I'm very intersted in how Voipfone can integrate with CRM software and even build some simple CRM software of our own - it seems to me that this is an area where simple CRM stuff could be provided for micro businesses quite cheaply and effectively.
Someone has done "something" (that's the extent of my technical knowledge here) to interface VTiger CRM with some telephone thingy. Not sure what it does exactly, but it's briefly described here: http://forums.vtiger.com/viewtopic.php?t=14314
Lumison have used Vtiger and have helped resolved some of the bugs. It is very adaptable and has some good reporting tools - but some of the add ons and plug ins need tweaking (eg email integration). Vtiger will also need hosting, but this is helpful if you are on the road a lot. Hosting also means you can get it backed up by your ISP - which is very important for business continuity.
We have used it for over a year now and it is getting better - worth a look as the download is free and includes LAMP to get you going.
Cheers
Adam