06/06/2023 updated
100 % available
IMS & EPC Consultant, Senior Core Network Engineer
Hungary
Only remote
BillingMessage Transfer AgentMedical EmergencyGPRS Core NetworksNetwork EngineeringTestingCiscoVoice over Broadband (VoBB)Swap (finance)
I have in-depth experience with several types of delivery projects both in the EPC and IMS domains. Projects include newly deployed networks, merging of existing networks, vendor swaps and major migrations between networks.
I have extensive experience designing, planning, testing and implementing, among others, on the following network elements:
MME, S-GW, P-GW, SGSN, GGSN, A-SBC/P-CSCF, I-SBC, E-CSCF, S/I-CSCF, MTAS, ATS, DRA, PCRF with the following vendors: Huawei, Ericsson, Cisco/Starent.
I have experience in integrating, testing and troubleshooting LI solutions with the above network elements.
I am very dedicated to my work and enjoy planning and executing large-scale projects, coordinating and cooperating with a variety of participants and stakeholders from management through to peer departments such as IT/provisioning, billing/mediation/charging, Lawful Interception and Data Disclosure, etc.
Major projects:
2019-2023 Vodafone Hungary
- VoLTE Network redesign to accomodate fixed line, VoBB subscribers and create a converged IMS Core network
- Introduction of VoWifi, SMSoIP/IP-SM-GW, VoLTE & VoWifi Emergency and VoLTE Outbound Roaming services in parallel
2017-2019 Digi Hungary
- Plan, deploy, test and launch a completely new VoLTE + 2G network including EPC, IMS and SMSC/IP-SM-GW
2016 Telenor Hungary
- VoLTE service introduction
2014-2016 Vodafone Hungary
- LTE introduction, LTE Roaming planning, testing and launch
2012-2013 Vodafone Netherlands
- Massive APN migration project. Migration of over 500 APNs within 6 months
2008-2010 Telekom Hungary
- Packet Core network swap from Ericsson to Huawei
I have extensive experience designing, planning, testing and implementing, among others, on the following network elements:
MME, S-GW, P-GW, SGSN, GGSN, A-SBC/P-CSCF, I-SBC, E-CSCF, S/I-CSCF, MTAS, ATS, DRA, PCRF with the following vendors: Huawei, Ericsson, Cisco/Starent.
I have experience in integrating, testing and troubleshooting LI solutions with the above network elements.
I am very dedicated to my work and enjoy planning and executing large-scale projects, coordinating and cooperating with a variety of participants and stakeholders from management through to peer departments such as IT/provisioning, billing/mediation/charging, Lawful Interception and Data Disclosure, etc.
Major projects:
2019-2023 Vodafone Hungary
- VoLTE Network redesign to accomodate fixed line, VoBB subscribers and create a converged IMS Core network
- Introduction of VoWifi, SMSoIP/IP-SM-GW, VoLTE & VoWifi Emergency and VoLTE Outbound Roaming services in parallel
2017-2019 Digi Hungary
- Plan, deploy, test and launch a completely new VoLTE + 2G network including EPC, IMS and SMSC/IP-SM-GW
2016 Telenor Hungary
- VoLTE service introduction
2014-2016 Vodafone Hungary
- LTE introduction, LTE Roaming planning, testing and launch
2012-2013 Vodafone Netherlands
- Massive APN migration project. Migration of over 500 APNs within 6 months
2008-2010 Telekom Hungary
- Packet Core network swap from Ericsson to Huawei
Experience
Professional experience10+ years
Freelancer since2019
Languages
EnglishNative speaker
Project history
- Responsible for the service design, implementation and testing/validation of the major merger project after Vodafone purchased Liberty Global’s fixed line services in Czech Republic, Germany, Hungary and Romania.
- The project scope was to expand Vodafone’s VMWare-based virtualized VoLTE IMS to allow fixed line (VoBB) services in the new FMC IMS network.
- Work closely with Huawei engineers on the design and implementation of the expanded service without interruption to existing live VoLTE services.
- Participate in in-depth troubleshooting of VoLTE-related issues in the existing network.
- Act as technical SPOC regarding IMS services towards peer departments such as Provisioning, Charging/Mediation, IP teams for network connectivity.
- Re-design existing VoLTE Lawful Interception solution based on Huawei recommendations to allow LI for newly migrated VoBB subscribers.
- Oversee and participate in migration of 700,000+ fixed line subscribers from Liberty Global’s network to the expanded and newly deployed IMS NEs in 15 iterations.
- Oversee and organize complex upgrade project to bring all IMS elements to the latest available release followed by VMWare upgrade to the latest bundle.
- Oversee and coordinate the service design and HLD provided by Huawei for VoWifi, SMSoIP, VoLTE&VoWifi Emergency calls and VoLTE Outbound Roaming in parallel
- Plan the above 4 services with special consideration of the effects and interaction between each other and the effects on existing VoLTE services.
- Design, Configure and Implement the 4 services first in test and then in live environment with minimal support from the vendor both in the IMS and EPC domains.
- Give technical input in preparation for OneNumber introduction projects.
* Senior Core Network Engineer leading a team of 5 engineers responsible
for IMS
* Set up a completely new mobile core network originally designed as
VoLTE/VoWifi only. Later ICS-based (IMS Centralized Services) 2G
network was added to allow all older mobiles to access the network. (Digi is
the 4th mobile operator in Hungary launching commercial service at the end
of May 2019)
* Responsible for Digi side of dimensioning, planning, designing,
implementing newly deployed Ericsson virtualized IMS network on Ericsson
BSP platform with Openstack-based CEE virtualization environment.
* Configure and troubleshoot VoLTE / VoWifi / CAMEL-based ICS (for 2G
and roaming) network starting from Ericsson basic configuration and finetuning
it according to local network, interconnect partner and VoLTE/VoWifi
terminal requirements.
* Troubleshoot and tune network to allow interworking with SIP-based UEs
from many different vendors including Samsung, Huawei, LG, OnePlus,
Xiaomi, Allview, etc. (UE vendor side cooperation not always available thus
problems have to be solved on mobile network side.)
* Main nodes in IMS network in Digi: SBC (SBG + BGF) / P-CSCF and IBCF,
CSCF (I/S/E-CSCF), MTAS (MMTel AS, SCCAS, MRFC, gsmSCF,
Interworking AS), DNS/ENUM, AAA, MRFP, MGCF)
* Carry out and troubleshoot upgrades of Ericsson CEE virtualization
environment based on Openstack using Ericsson scripts and guides.
* Plan and re-arrange virtualized nodes to make space for testing VNFs for
converged fixed network IMS in proof-of-concept phase.
* Plan and implement network configuration for emulating existing fixed
network services in the virtualized IMS environment in preparation for fixed
core network swap.
* In-depth troubleshooting of IMS call-flows using pcap capture files with
complex Wireshark filters and IMS nodes' internal logs and
application/system level debug tracing.
* Design interconnect configuration for SIP and ISUP connection with
partners.
* Lead integration and troubleshooting of LI related equipment and functions
for compliance with regulatory requirements.
* Lead and train team of engineers with approved access to LI equipment for
day-to-day operations
* Guide team of 2 focusing on VoLTE/VoWifi terminal testing to get mobile
phone software approved by Digi (vendors such as Samsung, Huawei, LG,
etc)
* Participate in EPC network troubleshooting when necessary
for IMS
* Set up a completely new mobile core network originally designed as
VoLTE/VoWifi only. Later ICS-based (IMS Centralized Services) 2G
network was added to allow all older mobiles to access the network. (Digi is
the 4th mobile operator in Hungary launching commercial service at the end
of May 2019)
* Responsible for Digi side of dimensioning, planning, designing,
implementing newly deployed Ericsson virtualized IMS network on Ericsson
BSP platform with Openstack-based CEE virtualization environment.
* Configure and troubleshoot VoLTE / VoWifi / CAMEL-based ICS (for 2G
and roaming) network starting from Ericsson basic configuration and finetuning
it according to local network, interconnect partner and VoLTE/VoWifi
terminal requirements.
* Troubleshoot and tune network to allow interworking with SIP-based UEs
from many different vendors including Samsung, Huawei, LG, OnePlus,
Xiaomi, Allview, etc. (UE vendor side cooperation not always available thus
problems have to be solved on mobile network side.)
* Main nodes in IMS network in Digi: SBC (SBG + BGF) / P-CSCF and IBCF,
CSCF (I/S/E-CSCF), MTAS (MMTel AS, SCCAS, MRFC, gsmSCF,
Interworking AS), DNS/ENUM, AAA, MRFP, MGCF)
* Carry out and troubleshoot upgrades of Ericsson CEE virtualization
environment based on Openstack using Ericsson scripts and guides.
* Plan and re-arrange virtualized nodes to make space for testing VNFs for
converged fixed network IMS in proof-of-concept phase.
* Plan and implement network configuration for emulating existing fixed
network services in the virtualized IMS environment in preparation for fixed
core network swap.
* In-depth troubleshooting of IMS call-flows using pcap capture files with
complex Wireshark filters and IMS nodes' internal logs and
application/system level debug tracing.
* Design interconnect configuration for SIP and ISUP connection with
partners.
* Lead integration and troubleshooting of LI related equipment and functions
for compliance with regulatory requirements.
* Lead and train team of engineers with approved access to LI equipment for
day-to-day operations
* Guide team of 2 focusing on VoLTE/VoWifi terminal testing to get mobile
phone software approved by Digi (vendors such as Samsung, Huawei, LG,
etc)
* Participate in EPC network troubleshooting when necessary
* Support Telenor virtualized IMS project for VoLTE introduction
* Participate in live network deployment of virtualized IMS network elements
on Huawei E9000 NFV platform
* Vertical integration of FusionSphere Openstack, FusionManager, MANO
and Virtualized Network Functions
* Complex troubleshooting of IMS network elements during setup of test
environment
* Responsible for complete Acceptance Testing of all services and functions
in the test and live networks.
* Live network integration of IMS network elements with all peer devices.
* Participate in live network deployment of virtualized IMS network elements
on Huawei E9000 NFV platform
* Vertical integration of FusionSphere Openstack, FusionManager, MANO
and Virtualized Network Functions
* Complex troubleshooting of IMS network elements during setup of test
environment
* Responsible for complete Acceptance Testing of all services and functions
in the test and live networks.
* Live network integration of IMS network elements with all peer devices.