Job Title: Network TAC Engineer / VOIP Support (24x7)Client: Leading USA Telecom &

- Managed Service ProviderLocation: [Specify Location]Job Type: Full-time / Shift-based (24x7 Support)Job Summary:We are seeking a skilled Network TAC Engineer/VOIP Support professional to provide high-quality technical support for Voice over Internet Protocol (VoIP) services. The ideal candidate will interact with US-based enterprise clients/customers, troubleshoot VoIP infrastructure issues, configure SIP trunking, and resolve critical network-related problems. This role requires expertise in VoIP systems, SBC, IP-PBX, call routing, and Unified Communications troubleshooting.Key Responsibilities:Technical Support &
- Troubleshooting:
- Provide L2/L3 technical support to enterprise customers for VoIP services.
- Configure and troubleshoot SIP Trunking customers in Session Border Controllers (SBCs), including DID and Pilot number configuration.
- Deploy, configure, and troubleshoot VoIP infrastructure, including IP-PBX systems, gateways, SBCs, and soft switches.
- Configure voicemail accounts, auto-attendants, call queues, dial plans, and call routing.
- Diagnose and resolve issues related to voice quality, call routing, call drops, echo, jitter, and latency.
- Troubleshoot Netsapiens &
- Cisco BroadWorks/BroadSoft Unified Communications (UC) issues.
- Handle Polycom, Yealink, Grandstream, Cisco ATA, Adtran routers, PSTN, SIP trunking, and analog lines.
- Work on Hosted PBX, On-premises IP telephony platforms, Unified Communications solutions, Unified Contact Center Enterprise, MS Teams direct routing, and cloud telephony solutions.
- Block unauthorized IPs, detect and prevent DoS attacks using NOM, Fail2Ban alerts.




- Troubleshoot Softphone, Toll-Free, DID, SD-WAN, Firewalls, QoS, COS, RTP, SIP codecs.
- Resolve IP circuit, Ethernet circuit, and SD-WAN issues.
- Perform ADTRAN router backups via CLI.

Monitoring &
- Escalations:

- Monitor network performance and voice quality using key parameters such as PDD, ASR, ACD, FAS.
- Identify and block **fraudulent/suspicious calls and compromised users

4oYou said:ask question to the candidates

ChatGPT said:Here are some interview questions for the Network TAC Engineer/VOIP Support (24x7) role. These questions will help evaluate candidates' technical knowledge, problem-solving skills, and customer support expertise.? General Questions:

1. Can you briefly introduce yourself and walk us through your experience in VoIP and network troubleshooting?
2. What motivated you to apply for this role?
3. Have you worked in a 24x7 support workplace before? How do you handle high-pressure situations?
4. Can you share an instance where you resolved a complex VoIP issue for an enterprise customer?

? Technical Questions:VoIP &

- SIP Trunking:

1. What is SIP Trunking, and how does it work?
2. How do you configure a SIP trunk on a Session Border Controller (SBC)?
3. What are the common issues in SIP Trunking, and how do you troubleshoot them?
4.



What tools do you use to analyze SIP call flows and diagnose call failures?

Unified Communications (UC) &
- IP Telephony:

1. What is the difference between Hosted PBX and On-Premises PBX?
2. Have you worked with Cisco BroadWorks/BroadSoft or Netsapiens UC platforms? If so, what were your responsibilities?
3. How would you troubleshoot one-way audio issues in a VoIP environment?
4. What are QoS and COS, and how do they impact VoIP call quality?

Troubleshooting &
- Network Support:

1. What is the purpose of RTP in VoIP communication?
2. A customer complains of poor voice quality and dropped calls. How would you troubleshoot the issue?
3. How would you diagnose and fix unauthorized VoIP calls or SIP fraud attacks?
4. What steps do you take to resolve SD-WAN and firewall-related issues affecting VoIP performance?
5. Can you explain Fail2Ban and how it helps in securing VoIP systems?

Technical Hands-On Scenarios:

1. How would you back up an ADTRAN router using CLI?
2. How do you configure a call queue, auto attendant, or voicemail system for an enterprise customer?
3. What is a DID number, and how is it configured in a VoIP system?

? Behavioral &
- Situational Questions:

1. How do you prioritize multiple high-priority support tickets during a busy shift?
2. Have you ever had to deal with an irate customer? How did you handle it?
3. Describe a time when you collaborated with a third-party vendor to resolve a network issue.
4. How do you ensure accurate documentation of issue resolutions for future reference?
5. What steps do you take to continuously improve your VoIP troubleshooting skills?

📌 Network TAC Engineer / VOIP Support (24x7) (Pune)
🏢 VLaunchU
📍 Pune