I love writing software

Design/Implementation of Voice core in Telco network. Signalling, Media, SIP, IMS, VoLTE. Leading design of stateless, scalable, cross region/datacenter voice signalling platform to integrate web and traditional telco protocols through generations of mobile networks from 2G to 5G.

Building Telcos one can rent

Working on communication products and a cloud based software platform for mobile virtual operator.

H.323,SIP, ICE Expert.Working with fitting Paradial's product portfolio to Lifesize cloud services and new virtual and hardware platforms including x86, ARM, PPC. Microsoft Lync certification of MS-ICE2 implementation for Lifesize's videoconferencing Endpoints.Added bandwidth management for MS-SIP calls using MS-TURNBW.

Designed software that eventually sold Paradial to Lifesize Communications Division of Logitech. This includes implementation of ICE RFC5245, TURN RFC5766 client and server, proprietary firewall/NAT traversal for H.323 client and server, ITU.T H.460.18 and H.460.19 both client and server, H323 Gatekeeper, added ICE firewall/NAT traversal to H.323(AFAIK,only implementation on the market that does ICE for H.323), Microsoft variants of the ICE(MS-ICE2), TURN(MS-TURN) and Microsoft SIP to SIP… Show more Designed software that eventually sold Paradial to Lifesize Communications Division of Logitech. This includes implementation of ICE RFC5245, TURN RFC5766 client and server, proprietary firewall/NAT traversal for H.323 client and server, ITU.T H.460.18 and H.460.19 both client and server, H323 Gatekeeper, added ICE firewall/NAT traversal to H.323(AFAIK,only implementation on the market that does ICE for H.323), Microsoft variants of the ICE(MS-ICE2), TURN(MS-TURN) and Microsoft SIP to SIP gateway.Also redesigned Paradial's ISP oriented deployment model in order to add support for Enterprise model where SIP and H.323 Gatekeepers/Gateways find themselfs on private LANs rather than on public Internet.Using in house built network simulator I created test tools that verify system functionality for more that 2K unique SIP and H.323 call scenarios which arise from the use of different set of SIP registrars/proxies, H.323 Gatekeepers, different deployment variants and NAT/Firewalls types that fragment the test net. Plugged this in to the Continuous Integration system to fully automate the regression testing. Show less

Maintained the first generation of the OTRUM's embedded TV module based on i486 and VxWorks. The WWW browser was an embedded variant of Netscape Navigator with support for HTML 3.2 and Javascript 1.0 and required a lot of work on its WWW and Javascript engines to be able to connect to the modern at that time email/news services like Yahoo and Hotmail which already moved to HTML4 and Javascript 1.1/1.2. Along with this work I added support for Cyrillic and Arabic fonts and right to left… Show more Maintained the first generation of the OTRUM's embedded TV module based on i486 and VxWorks. The WWW browser was an embedded variant of Netscape Navigator with support for HTML 3.2 and Javascript 1.0 and required a lot of work on its WWW and Javascript engines to be able to connect to the modern at that time email/news services like Yahoo and Hotmail which already moved to HTML4 and Javascript 1.1/1.2. Along with this work I added support for Cyrillic and Arabic fonts and right to left rendering mode for Arabic texts.Designed software for next generation of the embedded TV module which was Linux based running on ATI SoC XILLEON 220. Developed a protocol to present on the TV Screen the UI and Hotel Menus rendered by the Backend. Modified Mozilla's graphics and widgets subsystem to use this protocol to convey rendering result from Backend to the embedded module. Eventually embedded this version of Mozilla to the module itself without overhead of the widgets toolkit like gtk and with extensive use of the 2D accelerated graphics capabilities provided by the XILLEON chip. Show less

I was working on H323 Softswitch application solving interop issues between different H.323 Gateway Vendors. Integrated in SIP B2BUA application developed in house with H.323 Softswitch resulting in H.323 to SIP gateway.

I was writing code for physical layer subsystem in Ericsson switch that was supervising SDH/PDH/SONET termination. Worked with all phases of the design flow from requirements capturing and functional design down to the implementation and verification