Hire the Best Cisco CallManager Specialists in Dhaka, BD

I help businesses design, secure, troubleshoot, and optimize enterprise network and infrastructure environments. With 12+ years of hands-on experience in ISP, Data Center, Enterprise Networking, and Systems Administration, I have successfully deployed and managed Cisco, Palo Alto, MikroTik, VMware, Linux, and cloud-based infrastructure solutions for organizations of all sizes. My expertise includes Network Architecture, Network Security, Firewall Deployment, Routing & Switching, VMware Virtualization, Linux Administration, and Infrastructure Monitoring. I specialize in designing highly available, scalable, and secure environments that improve performance, reduce downtime, and support business growth. Core Expertise: ✔ Network Architecture & Design ✔ Network Security & Firewall Solutions (Palo Alto, Cisco ASA/FTD, pfSense, Sophos) ✔ Enterprise Routing & Switching (BGP, OSPF, EIGRP, MPLS) ✔ Data Center & ISP Network Infrastructure ✔ Cisco Nexus, Catalyst, ISR, ASR & Meraki ✔ MikroTik Routing, VPN, VLAN & Automation ✔ VMware vSphere, ESXi & Virtualization ✔ Linux System Administration (RHEL, CentOS, Ubuntu, Debian) ✔ AWS Networking & Cloud Infrastructure ✔ Monitoring & Observability (Zabbix, SolarWinds, Grafana, Prometheus, LibreNMS) ✔ Network Automation using Python ✔ Security Assessment (Wazuh, Nessus, Nmap, OpenVAS) ✔ SSL/TLS Certificate Deployment & Management (Commercial SSL, Let's Encrypt, Renewal & Troubleshooting) ✔ Linux Infrastructure & Services DNS (Primary DNS, Secondary DNS) Mail Servers (Zimbra, Postfix) Web Servers (Apache, Nginx) Hosting Platforms (WHM, cPanel, WordPress) FTP Services TACACS+ FreeRADIUS Samba File Services Whether you need a new network deployment, firewall migration, VPN implementation, BGP/MPLS troubleshooting, VMware infrastructure support, or security hardening, I can deliver reliable and business-focused solutions. Let's discuss how I can help strengthen and optimize your infrastructure.

Hi, Need any help in your network infrastructure? I am glad to provide any kind of network solution that persists in my area of expertise. I help my clients to grow their businesses by improving their network efficiency as well as security and ensuring the best experiences for customers so that they can revisit me and grow their businesses together. I have plenty of experience in installation, configuration and maintenance of different Cisco products. I also have experience working with some global vendor like Dimension Data, Logicalis Hongkong, Global NTT, British Telecom (BT) etc with different projects. I can provide a vast range of services, from Virtual Assistance to developing big projects. I can serve you better than anyone else for all your IT needs. Some of my recent projects include the below device installation Meraki - MR, MS, and MX series installation Routers: Cisco: 1900, 2900, 2800, 2600, 7206, 3745,ISR 4300 L2/L3 Switch: Cisco(Catalyst): 2800,3650, 3750, 3850, 4500, 6800,9300 Security Device :Cisoco FPWR 1000,1100,2100,3100 series Cisco ASA 5500-X Series, NGFW, ESA, CheckPoint NGTP,NGTX, Fortinate FG-80D, Watch Guard Servers: Dell Power edge T310, Hp Rx 2660, HP ProLiant DL360 Series Wireless Tools: Cisco Access Point :1800,2600,2700,2800,3800,9100 Aruba AP : 535,565, IAP installation. Wireless Controller : 2504,5504,5520,9800 Aruba 7200 mobility controllers. Wan Optimization: Riverbed: SteelHead CX Networking tools: GNS: Configuration testing for Cisco IOS Video Conferencing Tools Polycom RealPresence Group Series,Polycom VSX Endpoints, Polycom HDX Endpoints, Cisco Teleprasence SX20,Cisco MX300 G2 Key Certifications / Skills : 1. Cisco CCNP (Security Core) 2. Cisco CCNA (Routing & Switching) 3. Cisco CCNA-Security 4. Black Belt Meraki Deployment 5. Cisco Networking: On-Premise and Cloud Solutions (OCSE) 6. CyberOpsAssoc 7. Cisco Certified Design Expert (CCDE)

IT, VoIP, Unified Communications and Collaboration engineer, and System Engineer with over ten years of experience. I am a hard-working, solution-focused individual whose priority is always customer satisfaction. I have extensive experience with 3CX/Mitel/Aastra/FreePBX systems, as well as Linux and network administration. I can meet specific customer requirements, from dial plans to Call flow design. I can debug a variety of call connection and quality issues and have the ability to do advanced troubleshooting on these types of problems. I worked on the Mitel Unified Communication and Collaboration project for Large Government organizations and Private Organizations of Bangladesh with 5000+ users and multiple Nodes, designing the communications infrastructure piece of that system. I have completed 10+ projects, most of those with 100+ users, 10+ SIP & E1 Trunks, Call flow design, Multiple IVRs, ATA/FXS, and FXO for analog telephones on another marketplace within the joining of 2 months. I am committed to meeting your needs efficiently, effectively, and on schedule.

I have over 12+ Years of working experience in the Networking Field. I am an enthusiastic NETWORK ENGINEER with the necessary drive and determination needed to resolve complex networking issues. Possessing effective organizational skills and excellent working knowledge of networking technologies and having a commitment to keep up to date with the latest developments. I’m an adaptable and efficient team player with excellent communication skills at all levels. Experienced in providing motivation, guidance, and an up-to-date networking consultancy service to clients. Now looking for a new and challenging network engineering task that will make the best use of my existing skills and experience and also further my career as a freelancer. Technical Skill Set Summary:::::::: • Cisco routers / switches / WLC • Cisco ASA / FTD / ISE / FMC • Cisco NX-OS • Network Automation using Python3 • Checkpoint Firewall & Endpoint Security • Sophos XG Firewall & Intercept X with advance EDR • Gateway Redundancy Protocols: HSRP / VRRP / GLBP • Routing: RIPng / OSPF / EIGRP / BGP / PBR / PfR / VRF • VLANs / STP / RSTP / Ether channel (LAG) • VPNs – GRE / IPSec / DMVPN • LAN-WAN / NAT / ACL • IPv4 / IPv6 • F5 Load Balancer • SIEM-Splunk, Qradar, Wazhu, Suricata, Elastic • Juniper Junos • Palo Alto Next-Generation Firewall • Fortinet Solutions- FortiGate Firewall, FortiMail email gateway, and FortiAnalyzer. • Juniper firewalls SRX Series • TCP/IP, DNS, DHCP • Wireshark • MikroTik • Virtualization: VMware vSphere 6.x • Windows Server 2012 R2 Qualifications: • Cisco Certified Specialist - Security Core (CCNP SCOR-350-701) • Cisco Certified Network Associate (CCNA-R&S) • Palo Alto Networks Certified Network Security Engineer (PCNSE) • APPLICATION DELIVERY FUNDAMENTALS (F5-101) • Fortinet Network Security Expert (NSE 1, NSE 2, NSE 3 & NSE 4) • JNCIA-SEC (JNCIA-SEC) • Junos (JNCIA-Junos)

I'm a VoIP, Network & Security Engineer with over 10 years of hands-on experience building, managing, and securing enterprise and carrier-grade infrastructure. I've worked in the core network of one of Bangladesh's largest ISPs — designing solutions that handle real scale, real traffic, and real uptime requirements. I specialize in the full range of VoIP platforms — from SMB-focused systems like 3CX and FreePBX to carrier-grade switching and billing platforms including PortaOne (PortaSwitch, PortaBilling) and Telinta (TeliCore). If you're a VoIP provider, MVNO, or wholesale carrier needing a scalable multi-tenant platform, class-5 softswitch, or prepaid/postpaid billing setup, I can help you design, deploy, and maintain it. I also provide full US telecom regulatory compliance support — including STIR/SHAKEN implementation for call authentication and 10DLC (10-Digit Long Code) registration for A2P SMS campaigns. Whether you're a CPaaS provider, VoIP operator, or business needing compliant SMS messaging, I handle brand registration, campaign vetting, TCR submission, and carrier approval — keeping you out of filtering and in line with FCC and CTIA requirements. Beyond voice, my expertise covers the full network stack: BGP/OSPF routing, MPLS, firewall hardening with Fortigate and Sophos, IPsec/GRE VPNs, and cloud deployments on AWS and Azure. What you can expect: clear communication, documented deliverables, and no surprises. I scope projects carefully, flag issues early, and stay available through go-live and beyond. Telecom platform support: PortaOne (PortaSwitch · PortaBilling · PortaSIP) · Telinta (TeliCore softswitch · hosted VoIP · calling card billing) · FusionPBX · Asterisk · FreePBX · 3CX — from initial provisioning and trunk configuration to billing plan setup, DID routing, and ongoing admin. Regulatory & compliance: STIR/SHAKEN (SHAKEN attestation, STI-CA enrollment, signed calls) · 10DLC A2P SMS (TCR brand & campaign registration, carrier vetting, CSP setup) · FCC telecom compliance · SIP fraud prevention · call authentication best practices.

Network and systems specialist with more than 9+ years of experience in designing, configuring, troubleshooting, and documenting various IT scenarios for ISPs, enterprises, startups and campus networks. Currently working at an expert level with a variety of network technologies (Cisco, Juniper, Fortinet, Huawei, bgp, isis, ospf, mpls,L2/L3 vpn, ipsec vpn, routing-switching, Multicast, Security, AAA/RADIUS, Network Monitoring windows, linux etc.). Dedicated, flexible and committed to accomplishing any given task/goal without supervision; Keen to learn new skills and adapt to changes. I'm seeking opportunities to audit, build, reconfigure or maintain network or server infrastructure of any company. Vendor Certification: # Red Hat Certified Engineer (RHCE) # Red Hat Certified System Administrator (RHCSA) # Cisco Certified Network Associate (CCNA)