Abstract: SIP protocol is introduced into existing embedded Internet field to solve El problems, which belongs to VoIP technology. The interface between SIP and original model is thus implemented on existing architecture. A new embedded Internet location model based on SIP protocol, i. e. ESL model, is also presented to name application layers and meet the increasingly growing high-layer demands. In particular ESL model gains an advantage over others that it enables El systems to be intelligent with security in remote locating process and access of mobile devices.