MANJUNATH PARAPPA

556 CountryBrook Loop CA 94583

C;484-682-5238 ; manju_pb@yahoo.com

 

SUMMARY

·   Overall 15 years of experience in Telecom industry (Wireless and Cable), worked extensively on VoLTE network elements and VoIP products such as 4GLTE, Cable modem, eDVA, eMTA on EPC and IMS network (ALU RAN, Nokia Siemens NSN and Ericsson RAN).

·   Very familiar with VoLTE KPIs (Accessibility and Retainability)

·   Hands on experience on Packet Core networks using Tektronix tool such as Iris session analyzer.

·   Hands on experience on SIP protocol and call flow.

·   Packet Analysis of VoLTE call flow such as 3G and SIP.

·   Performed advanced VoLTE and LTE call processing troubleshooting with focus on SIP, RTP/RTCP, GTP, Diameter protocols and interfaces including Gm, S1, Cx, Gx Rx, S6a, S5/8, S11, S10

·   Hands on experience in RF by use of QXDM QCAT

·   Performed Automation test on various vendors (Arris, Cisco, Motorola, SMC, Ubee, Samsung, Technicolor, and Pace for VoIP Certification Wave on DOCSIS 3.0 and DOCSIS 2.0 CMTS.

·   Performed Data throughput testing using IXIA.

·   Hands on experience with Cisco 7200 router IOS version 12.2(33) SCB4, Cisco uBR10012 router IOS version 12.2(33)SCC5.

·   Performed IPv6 test on DOCSIS 3.0 and 2.0 devices.

·   Performed Fail over testing on IMS network.

·   Generated defects and updated HP Quality Center periodically. 

·   Hands on experience on network management and provisioning (XML, SNMP, LDAP, SOAP)

·   Performed  IOT activity on various vendors product on IMS network.

·   Hands on experience on VoIP CPE testing on Docsis 3.0 and 2.0

·   Proficient in cable labs and packet cable specification.

·   Proficient in 3GPP specification.

·   Prepared Test producers and Test plan based on customer specific requirements.

·   Have single handedly led and coordinated projects, prior responsibility reflects good leadership qualities, team player with excellent interpersonal skills.

·   Good knowledge in White-Box, Black Box and Full Life Cycle Testing. Prepared and executed Sanity, Integration, Functionality, Performance, Load, Regression, Stress and System tests.

·   Experience in software verification, validation and testing methodology.

·   Proficient in call analysis with Wireshark and EMPERIX Hammer.

 

TECHNICAL SKILLS

Telecom Protocols:    VoLTE, EPC MME (S1-MME, S11, S6a) SGW (S1U, S5), VOIP (SIP, NCS),

PCEF, PCRF (Gx and Rx), DIAMETER (Cx and Sh), IMS, SDP, RTP, RTCP,

IPv6, DOCSIS 3.0 and 2.0, SS7 and CDMA

 

Tools:   Tektronix Iris Session Analyzer, Protocol Analyzer, Snooper, QXDM, HP Quality Center, Jira, Cisco IOS version (12.2(33)SCB4, Cisco 7200 router (vxr01), Cisco Ubr10012 router (IOS version 12.2(33)SCC5) , Cisco Broadband Access Center DPE, SOAP, Cisco CNR (DNS/DHCP), TFTP, Cisco BTS, Cedar Point Safari, Nortel, Huawei, Share point, T-BERT, Spirent (Abacus, ), Sage, Smartbits, IXIA, Sigtek, Sage, SNMP MIB Browser, Advent AI-5120, Clear Quest, RADIUS(AAA), SS7-Inet tester and Simulator. Nokia-Siemens IMS, Huawei IMS, Ericson IMS, EMPERIX HAMMER and ALU (PlexView).

 

Languages:    C, Perl scripting

 

Operating System:   Solaris, Linux, UNIX, Windows 7, MS-Dos

Documentation Tools:     MS-Word, MS-Excel

EDUCATION

·   Masters Degree in Computer Applications from Mysore  University , India

 

PROFESSIONAL EXPERIENCE

AT&T Inc, CA                                                           Sept 2013 – Present   

Role:Solution Architect         

Project:E2E KPI Analysis of   VoLTE devices on EPC and IMS network         

Responsibilities:

·   Carried out extensive and complex E2E VoLTE calls investigation of issues

Impacting the AT&T network KPIs

·   Performed RCA of VoLTE calls on EPC and IMS network.

·   Trouble shooting call setup failure and call drop failure.

·   Performed end-to-end VoLTE voice call with eSRVCC on LTE to 3G network.

·   Performed Initial Registration of VoLTE device on EPC and IMS network.

·   Performed IOT with different vendor’s devices.

·   Performed Supplementary Services like CFU, CFNR and CFB.

 

 

Time Warner Cable Inc, VA                                August 2012 – August 2013   

Role:Certification of VoIP Products   on IMS network         

Project:Certification of VoIP products on IMS network

Responsibilities:

·   Provisioning of eMTA, eDVA for TAS and No TAS using Cisco’s Broadband Access Center (BACC) on IMS network.

·   Performed call feature test between IMS and PSTN network and analyses SIP call flow.

·   Performed eDVA and eMTA testing involving end to end voice testing(codec -G711, G722)

on IMS network.

·   Performed Sanity, Regression and Call feature testing on IMS network

·   Performed Fail Over conditions on Nokia Siemens (NSN) IMS network

·   Create defect in Remedy center periodically.

·   Create Test Report and present at the end of each test cycle.

 

Comcast Cable Inc, PA                                   January 2011 – June 2012   

Role:Certification of VoIP Products           

Project:Certification of VoIP for Cable Modem, eMTA ,eDVA and Set-Top Box

Responsibilities:

·   Perform Secure Software download test through automation. (IPv4 and IPv6).

·   Provisioning of eMTA, eDVA for TAS and No TAS using Cisco’s Broadband Access Center (BACC) on IMS network.

·   Performed call feature test between IMS (Ericsson IMS) and PSTN network and analyses SIP call flow.

·   Perform stability, Provisioning, Dynamic Chanel Change test  through automation.

·   Provisioned various cable modems (Motorola, Arris, Thomson, Ubee and Scientific Atlanta) using Cisco’s Broadband Access Center for Cable (BACC). 

·   Create defect in HPQC center periodically.

·   Create Test Report and present at the end of each test cycle.

 

Motorola Inc, PA                                          August 2007 – December 2010

Role:Senior Test Engineer                           

Project:Testing of CMTS and eMTA

Description:Motorola solutions for cable provider-offering data and voice plans to end-user. The Solutions include CMTS, Cable Modem and Emta.

Responsibilities:

·   Performing end to end test by configuring the BSR/UBR CMTS in different modes, such as TDMA, ATDMA and SCDMA

·   Configured different modulation profile such as QPSK QAM

·   Performed through put test, involving 200 plus cable modems and CMTS.

·   Performed EMTA testing involving end to end voice testing with CMS supporting

·   SIP and NCS.

·   Performed Ad Hoc testing requiring changes to provisioning server, CMTS, DHCP server and  CMS .

·   Responsible for Sanity, Regression and Performance testing,

.

Continuous Computing Corp, CA                                            October 2004 – August 2007     

Role:Senior Test Engineer          

Project:SIP Interoperability Testing

Description:SIP is a text-based client-server protocol which specifies the procedures to establish, modify, or terminate multimedia session. CCPU’s SIP stack provides to establish, change, transfer, and tear down multimedia sessions or Calls. SIP stack acts as stateless and stateful proxy.

Responsibilities:

·   Performed SIP stack testing verifying all the parameters which inculdes SDP parameters.

·   Performed the behavior of stateful and state less proxy

·   Interaction with the development team and with the client.

·   Performed interoperability testing by using INET Spectra tool.

 

Utstarcom Inc, IL                                      October 2003 – September 2004     

Role:Senior Test Engineer                                              

Project:Prepaid Services

Description:This feature on the IWF (Inter Working Function) is prepaid service will be based on call duration only. When the users log into a 2G network with this service enabled they will be authenticated using The RADIUS interface.

 

Responsibilities:

·   Testing of different call scenarios with regression test suits.

·   Regression Test : In which we will check customers old functionality with the new data that is populated for the new functionality.

·   Feature Test : In which the new functionality and the interaction with the old functionality is tested from the customer point of view.

 

Alcatel USA, Plano, TX                                       April 2000 – September 2003     

Role:Solution Test Engineer  

Project:Soft Wireless Access Tandem (SWAT)

Description:Soft Wireless Access Tandem performs the location request query to the HLR for direct

routing of mobile call terminations. Mobile call terminations are both land-to-mobile and

mobile-to-mobile.  A new ‘mobile trigger’ is introduced in Megahub MM. This feature

provides the provision to arm the trigger at various digit level and arm or disarm the

trigger depending on the database configured. This new trigger takes precedence over the

existing Specific digit string trigger, LNP trigger. On occurrence of this new trigger on a

call origination from MSC, the MegaHub MM launches an IS41 Location Request TCAP

query message to HLR. The HLR optionally returns Digits for routing the call or

Treatment code for rejecting the call in the Location Request Return result message.

External signaling interfaces to the SWAT are the SS7 network  for ISUP signaling..

 

Responsibilities:

·   Launching of Mobile trigger to HLR by sending LocationRequest Invoke query.

·   Encoding  of query request to HLR.

·   Decoding of data from the HLR response and validating  the received data for further processing.

·   Processing of routing instruction from HLR.