This document contains the resume of Vambara Sampath Kumar. It summarizes his professional experience working for 10 years in IT organizations on various projects related to telecom software development using technologies like C, C++, SIP, H.323. It lists his educational qualifications and achievements like awards received for project delivery and contributions. It also provides details of some key projects he has worked on, including roles and responsibilities.

1. Vambara Sampath Kumar
B-212, Sri Kalki Heights,
Manjeera Pipe line Road, Madinaguda, Hyderabad-49
Mobile: +91-8790901355
email: vambarasampath@gmail.com
Achievement-driven and highly-focused professional with a proven
track record of Ten years with renowned IT Organizations of repute. Zest
for technology innovations – being chosen for large end-to-end
complex an mentally stimulating IT projects. Distinction of resolving challenging
customer issues across the globe. Recognized for comprehending the
entire product cycle linkages for specific problem/issue resolution
leading to project execution ahead of time. Acknowledgement of
superior performance with extensive customer appreciation. Bond
with cross-functional teams and global service providers for holistic
customer solutions.
Rich expertise in forecast and development of near accurate project
design documents that correlated with project execution well-within
budgeted costs, deadlines and resources. Excellent technical
proficiency coupled with a deep problem analysis having resolved
difficult technology issues.
Mentor – encouraged and guided members to deliver projects meeting
Organisation goals. Familiar with cultural diversities working with
teams across different time zones.
OUTSTANDING STRENGTHS
 Ability to conceptualize from the larger perspective
 Persistent ensuring end results, despite complexities
 Good client relationship management skills
 Sought-after by clients and management to resolve long standing
technical issues
 Fast-learner with the abilities to grasp at the grass-root levels
 Recipient of high customer service ratings
‘MD110-Maintence project
as the best project
executed at year 2006-
2007’
~ Awarded to whole team by
President of TPE Wipro
technologies~
‘Feather in My Cap Award’
~ for my contribution
towards delivery of no of
trouble reports in H.323
modules of the MD110
system ~
‘Star Award’
~Received this award in
Polycom technologies for my
contribution~
Stood 2nd
in Worldwide
Polycom internal Hackathon
Competition.

2. IT SKILLS
Programming Languages / Environment : C, C++, Assembler, OOP, LINUX/UNIX
Network/Telecom/RT/Systems Software : SIP, H.323(RAS,H.225,H.245), DNS, TCP/IP, RTP, SDP
Telecom Switch, End points : Polycom SPIP, Polycom VVX, Alcatel lucent OXE,
Ericsson MX-ONE, Nortel CS2K, ICOMM EPAX
Additional Tools/ Softwares : SIPP, SIP Inspector, AVT (Alcatel Voice Tool), Wireshark,
clearcase, ClearQuest, Jira
PROFESSIONAL WORK EXPERIENCE
Polycom Technologies R&D, Hyderabad 2013-Present
Tata Consultancy Services, Chennai 2010-2012
Wipro Technologies, Hyderabad 2007-2010
(A leading IT Organization SEI-CMMi Level 5 Company, NYSE:WIT)
ICOMM Tele Limited, Hyderabad 2005-2007
ACADEMIC CREDENTIALS
Bachelor of Engineering with specialization in Electronics and Communication Engineering, GITAM
College of engineering, 2004. Graduated with Distinction – 71.2 %
Diploma in Electronics and Communications engineering, Sir C R Reddy Polytechnic, 2000. Passed
with distinction – 81%
Professional Development:
Participated in several training programs of Corporate Human Resource Development like Power
Consulting, Emerging Leaders and various other technical training programs like IMS training, LINUX
internals.
PERSONAL DETAILS
Date of Birth : 19th July 1982
Passport No : G2270509

3. ANNEXURE – KEY PROJECTS
 Polycom VVX, SPIP phones SIP modules Enhancements & Feature development
DURATION : Jan 2013 – Present
ROLE : Lead Software Engineer
Work Location : Hyderabad
Environment : C++, SIP, Telecom
Platform : UNIX
Description:
Polycom VVX phones are VOIP phones developed on Linux platform using C++ supporting SIP and H.323
protocols.
Role:
Involved in Multiple feature developments, Enhancements, and implementation of support for multiple
RFCs using C++.
• Requirement gathering.
• Preparing the design documents like implementation sketch and implementations proposal.
• Development of High/Low level design based on the requirements.
• Coding/Unit testing and fixing of the integration issues.
 ALU OXE – SIP GW and SIP stack development
DURATION : Dec 2010 – Dec 2012
CLIENT : Alcatel Lucent
ROLE : IT analyst
Work Location : Chennai
Environment : C++, SIP, Telecom
Platform : UNIX
Description:
SIP motor is the module which acts as proxy server, SIP Gateway and the SIP Registrar. SIP motor is developed
on top of the ALU SIP stack.
Role:
• Requirement gathering.
• Preparing the design documents like implementation sketch and implementations proposal.
• Development of High/Low level design based on the requirements.
• Coding/Unit testing and fixing of the faults.
 Communication Server 2000: Maintenance
DURATION : Nov 2009 – Apr 2010
CLIENT : Nortel networks
TEAM SIZE : 9
ROLE : Module lead and Developer
Work Location : Bangalore
Environment : C++, SIP, Telecom
Platform : Sun Solaris
Description:

4. The Communication Server 2000 (CS 2000) is a Nortel Carrier Voice over IP (VoIP) super class softswitch on the
XA-Core Platform. It is an IMS-ready carrier grade softswitch operating in an open standards Nortel VoIP
network. It supports a wide range of signalling, transport and control protocols including both MGCP and SIP for
line gateways.
Role:
• Fixing of the faults raised during the system test, field trail and at customer locations.
• The faults reports are analyzed and answered according the priorities defined.
• Solving the technical query related to Trunk and VOIP.
 Communication Server 2000: Multiple Feature Implementations
DURATION : March 2009 – July 2009
CLIENT : Ericsson / Aastra
ROLE : Software Developer
Work Location : Hyderabad
Environment : C++, Linux, ClearCase, ClearQuest
Platform : SLES10, Windows 2003
DESCRIPTION:
The MX-ONE TS proprietary personal number (PN) feature also called as individual repeated distribution
(IRD) prevents a proper operation of a Solidus Call Centre Application as Solidus have no possibility to
retrieve and redistribute the call to another agent if a call has been distributed to an agent with active PN.
Now the feature enhancement is to have a control on the call even after the call is distributed to agent in
CTI/ACD group with active personal number.
RESPONSIBILITES:
• Requirement gathering
• Preparing implementation sketch and implementations proposal.
• Development of High/Low level design based on the requirements.
• Coding/Unit testing and fixing of the faults.
 H.323/SIP Terminal knowledge transfer
DURATION : April 2008- October 2008
CLIENT : Ericsson/Aastra
ROLE : software engineer
Work Location : Stockholm, Sweden
Environment : C, H.323, Workbench, Tornado, ClearCase, ClearQuest,
Platform : VxWorks, windows 2003
DESCRIPTION:
Ericssion/ Aastra IP telephones (DBC 42x02, DBC 42x01, DBC44601) are H.323v4 and SIP compliant. The user
interface in the telephone can be controlled locally in the IP telephone or from the gatekeeper via the
WAP channel. The IP telephone is adapted to work towards different PBXs working as gatekeeper/SIP
entity. It included the understating of VxWorks, Workbench Tornado, H323/SIP Stack, WAP Protocol, OMD,
Web-Server, IP-Phone-Administrator, IP-security and Configuration file, BOOT and My-DIALOG-4000-
CONTACTS
RESPONSIBILITES:
• Presentations to the client, about different module of DBC family

5. • Responsible of H.323 stack, WAP module sustenance and enhancement
• Fixing of the customer fault on time.
 Sustenance/Enhancement of VOIP Module
DURATION : January 2007 - March 2008
CLIENT : Ericsson/Aastra
TEAM SIZE : 8
ROLE : software engineer
Work Location : Hyderabad
Environment : C++, Linux, ClearCase, ClearQuest, TACOS, PLEX, Assembly for Motorola M68030
Processor
Platform : SES (System software for MD110), Windows 2003
DESCRIPTION:
MX-ONE/MD110 supports both H.323/SIP extensions and trunk. Any IP extensions can be connected towards
MX ONE/MD110 architecture as a specific extension type. Functionalities of Gateway and Gatekeeper are
performed by software units and firmware/hardware units (VOIP Card). Media authentication and
encryption is provided using SRTP for the media transmitted. Signaling authentication, encryption and
decryption is provided using TLS protocol. IP module supports many features Music on hold /wait, RVA,
Load Distribution, CAC feature.
The H.323 trunk interface allows the connection between MX ONE/MD110 and other H.323 systems
through a TCP/IP network.
RESPONSIBILITES:
• Fixing of the faults raise during the system test, field trail and at customer locations.
• The faults reports are analyzed and answered according the priorities defined.
• Solving the technical query related to Trunk and VOIP.
• Building the competency by giving the regular presentations.
 EPAX V1.0 Telecom switch software design and development
DURATION : December 2004 - June 2005
CLIENT : Indian Army/ Indian Air force
TEAM SIZE : 3
ROLE : design & development engineer
Work Location : Hyderabad
Environment : C, Kiel compiler, c8051f020 (cygnal) microcontroller,
Platform : Windows 2003
DESCRIPTION:
This project was taken up to develop an EPAX which is a small automatic exchange supporting 32 subscriber
ports, 32 E&M trunk ports and two PCM trunk ports. The exchange shall support transit facility. The
terminal is part of communication system meant for military applications.
RESPONSIBILITES:
• Preparing design documents for the system.
• Software development for line interface circuitry in the system, which includes call processing in the
subscriber line side such as hook sensing, tone-generation, DTMF detection and Caller-ID generation.

6. • Writing driver routines for 8-bit microcontroller c8051f020 peripherals like UART, timers, SPI, I2C and
external interrupts.
• Handling I2C data for inter-card communication using ‘c’ with data structures (queues).

7. • Writing driver routines for 8-bit microcontroller c8051f020 peripherals like UART, timers, SPI, I2C and
external interrupts.
• Handling I2C data for inter-card communication using ‘c’ with data structures (queues).