Tac Engineer Interview Questions

174 tac engineer interview questions shared by candidates

Explain how SIP handles NAT traversal. What role do STUN, TURN, and ICE play in this process? In SIP, what is the difference between a re-INVITE and UPDATE message? How does SIP forking work, and how is call state maintained across multiple endpoints? Can you explain RTP vs SRTP? How is encryption managed in real-time media streams? What mechanisms can be used in SIP to prevent toll fraud? How would you troubleshoot one-way audio issues in a SIP call flow? Explain SIP REGISTER, INVITE, and BYE message flows with detailed headersExplain how Python’s Global Interpreter Lock (GIL) affects multi-threaded applications. What’s the difference between synchronous, asynchronous, and multiprocessing in Python? How would you parse and analyze SIP packets using Python? Can you explain Python decorators and give a real-world use case in VOIP automation? What’s the difference between deep copy and shallow copy in Python objects? How would you design a Python script to monitor SIP call quality using RTP statistics (jitter, latency, packet loss)? How do you optimize Python code for low latency in real-time communication systems?
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TAC Engineer

Interviewed at GoTo

3.8
Sep 11, 2025

Explain how SIP handles NAT traversal. What role do STUN, TURN, and ICE play in this process? In SIP, what is the difference between a re-INVITE and UPDATE message? How does SIP forking work, and how is call state maintained across multiple endpoints? Can you explain RTP vs SRTP? How is encryption managed in real-time media streams? What mechanisms can be used in SIP to prevent toll fraud? How would you troubleshoot one-way audio issues in a SIP call flow? Explain SIP REGISTER, INVITE, and BYE message flows with detailed headersExplain how Python’s Global Interpreter Lock (GIL) affects multi-threaded applications. What’s the difference between synchronous, asynchronous, and multiprocessing in Python? How would you parse and analyze SIP packets using Python? Can you explain Python decorators and give a real-world use case in VOIP automation? What’s the difference between deep copy and shallow copy in Python objects? How would you design a Python script to monitor SIP call quality using RTP statistics (jitter, latency, packet loss)? How do you optimize Python code for low latency in real-time communication systems?

Scenario based questions as well as troubleshooting problems. Was given a scenario where traffic could reach from one host to another hosts which are connected via a series of switches and routers. Was asked to walk through how I would troubleshoot the given problem.
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TAC Engineer

Interviewed at Cisco

4.1
Jul 13, 2023

Scenario based questions as well as troubleshooting problems. Was given a scenario where traffic could reach from one host to another hosts which are connected via a series of switches and routers. Was asked to walk through how I would troubleshoot the given problem.

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