You are addicted to VoIP, you like SIP and all those wonderful SIP devices but you cannot ignore Skype user base? Try bridging Skype and SIP using free software from NCH Swift Sound: http://nch.com.au/skypetosip/index.html
The software lets you connect calls between the two systems. It connects both incoming and outgoing calls to the Skype network. Can be used to make SkypeOut calls from a SIP device or PBX or receive SkypeIn calls and direct them to your SIP extension.
In my tests the software performed in general well with a few crashes (related to playback/recording devices) reported by Skype.