The IP Telephony Express 642-144 IPTX is the exam associated with the Cisco IP Communications Express Specialist certification. Candidates can prepare for??642-144 exam by taking the IP Telephony Express (IPTX) course. This exam tests a candidate’s knowledge of VoIP and PSTN components and technologies and the candidate’s ability to install, configure and support Cisco Unified CallManager Express and Cisco Unity Express products in a Cisco network. Topics covered include basic VoIP, PSTN, and SIP, CallManager Express and Unity Express.If you know the related knowledge covered by real-exam.try hard for exam 642-144,Chat with me online if having any questions.