Sofia-SIP is a SIP user agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center.
piAccess Link adds AT command support to Symbian OS phones for SMS and phonebook retrieval, allowing access to the phone's text messages and contacts over Bluetooth from any personal computer and any standard AT command compatible software. The service is advertised via Bluetooth SDP for easy connection, and connections are supported over both incoming and outgoing Bluetooth connections.
WmConsole is a console server for Windows Mobile devices which listen over BlueTooth RFCOMM channels. It allows the user to interact with the device using a commandline interface from a Linux or Windows workstation. You need the QTTY Linux/Windows client to access a WmConsole server.