Patrick Wakano Email & Phone Number

Australia

Sydney, Australia

✔ Lead Voice Engineer, responsible for the voice services provided by the company✔ Successfully conducted a large assessment of the voice services in virtual machines on Microsoft Azure✔ Development of Asterisk based cloud IP Contact Center▪ Large refactoring of legacy Asterisk dialplan notoriously increasing service availability and uptime▪ Implemented a vast amount of Asterisk optimizations increasing system capacity▪ General Asterisk dialplan maintenance and bug fixes▪ Implementation of new features✔ Full development of a customized Session Border Controller using open source softwares (Kamailio, PostgreSQL, RTPEngine and Freeswitch)▪ Highly scalable architecture allowing thousands of simultaneous calls▪ High Availability cluster options, one with Master/Slave approach using Keepalived and floating/virtual IP. The other one for public cloud deployment using active-active operation leveraging Kamailio features.▪ Advanced routing logic for SIP trunking, with load balancing and failover support▪ SIP extensions connectivity supporting UDP/TCP/TLS and WebRTC technologies▪ Security features including extensive iptables rules for protection against DoS attacks and port scanning, built-in logic to address dictionary brute force attacks and unwanted call attempts, and ephemeral authentication for WebRTC clients▪ Several implementations done to allow a perfect working condition in MS Azure cloud✔ Created SIPp scripts for load tests and implemented an Asterisk server dialplan for functional test automation✔ General problems analysis and debugging for customer support/care

Curitiba, Brazil

✔ Design and deployment of open source IP telephony solutions for organizations and companies of the government of Paraná State.▪ Conducted the replacement of the VoIP solution at Detran/PR with more than 1000 users over more than 100 locations✔ Development and support of Asterisk based IP PBX:▪ General problems analysis and debugging.✔ Development and support of OpenSIPs proxy router:▪ Design and implementation of the routing logic;▪ Implementation of Master/Slave linux cluster using CRM and DRBD;▪ General problems analysis and debugging.✔ Studies and planning of new technologies to be integrated in the VoIP environment.✔ Development of a simple Session Border Controller using open source software (Netfilter, Snort, OpenSIPs and RTPProxy) tuned to provide network security to VoIP equipments connected to the internet.

Curitiba, Brazil

✔ Design of open source IP telephony solutions for organizations and companies of the government of Paraná State.✔ Definition of technical specifications for VoIP equipments to be acquired via public bidding.✔ Development and support of Asterisk based IP PBX: ▪ Performance tests using SIPp, shell and python scripts; ▪ Creation of Master/Slave linux cluster using CRM and DRBD; ▪ Creation of a Click-to-Call Javascript plugin for Mozilla and Chrome; ▪ General problems analysis and debugging.✔ Development and support of OpenSIPs proxy router: ▪ General problems analysis and debugging.✔ Technical specification of SMS service to be hired for the government of Paraná State.

Curitiba, Brazil

✔ Embedded software development of MPLS/L3VPN facilities for a Metro-Ethernet switch using C language.

Curitiba, Brazil

Contractor for Siemens Ltda.✔ Embedded software development for a PSTN-SIP gateway using C and C++ language:▪ SIP support for SRTP encryption;▪ SIP keep-alive mechanism;▪ Bug fixes for PBX-like telephony facilities using SIP protocol✔ Embedded software development of new functionalities and bug fixes for a TDM PBX with ISDN and CAS interfaces using C language.

Curitiba, Brazil

✔ Bug fixes for embedded software of a SME TDM PBX✔ Coding of scripts for automated tests

Mba In Telecommunications

Bachelor’S Degree, Electrical Engineering (Electronics/Telecommunications)

Elementary, Middle And High School