I am N.Narayanan 17 years experience in telecom Industry. Handled Different Handled various roles Testing, Deployment, Presales, Project Manager. Installed VAS Services (OBD, IVR, CVPS CG, SMSApp solutions, USSD Gateways, SIP servers) in all telecom operators in India and other countries (BSNL,Airtel,Aircel,Uninor,MTS,Idea,Reliance,Vodafone,MTNL,Hutch,Telenor). Experienced in call center integration using switches and open source (Asterisk, Open sips, free switch, Elastix, Mjsip, Pjsip, Freepbx, Mobicent, Avaya, NEC, SIEMENS, CISCO, GENESYS).Experienced in Voicemail, Cal logger solutions. Good knowledge in SBC, GSM Gateways. Experienced in SS7, SIP, ISDN, and SIGTRAN. Good knowledge in IVR, Dialer, and Dial plans. Major role implementing CMMI process for the products (Internal Audit team member, ISO).