Job description: Candidate should understand the Voice (VoIP) concepts like SIP, RTP, SRTP, TLS etc and SIP trunking Candidate should have an architectural view of how voice network is deployed and the elements of the same Candidate should also how security can be setup and influences for VoIP/Voice SIP networks Candidate should also know how Infrastructure virtualization plays a role in setting up voice network Candidate should know how layer 3 network etc plays a role in setting up Voice network All the above udnerstanding should be from a service provider envirnment stand point rather than an enterprise network stand point