I have a background in public and enterprise telephone systems (such as AXE-10, DMS-100, Alcatel OmniPCX 4400) installation and maintenance, and B.S. degrees in electrical engineering and computer science. Which career path is advisable to take considering my experience in voice switching technologies and current job market? Shall I take CCNA, CCNP, CCVP, wireless, ... certifications? Please send me your advices.