Top 50+ CCNA Voice Interview Questions | Cisco VoIP Interview Questions

Top Interview Questions for Cisco VoIP:
- Explain Cisco IP Phone boot up process?
- Which transport layer protocols are used for VoIP audio and video payload?
- What is RTP in case of VoIP? Which layer of OSI model does it work on?
- What is RTCP and what is its use?
- What is codec and DSP?
- What are the different versions of PVDM?
- What is Cisco FLP?
- What are the two POE methods?
- What is 802.3af and 802.3at?
- Why is it recommended to use a separate Vlan for IP Phones?
- What is option 150 and option 66 in DHCP?
- Explain Cisco UC Architecture?
- What is CUCM Cluster?
- What are Network Services and Feature Services? What is the difference between them?
- What is ANI and DNIS?
- Explain the process of signaling for call between two phones registered on a CME where all three devices are connected on the same switch.
- What is FXO and FXS?
- What is T1 and E1? How many D and B channels do they have in case of ISDN?
- What is CAS and CCS?
- Explain Q.931 and its use.
- What is Dial-peer?
- What are the matching criteria for incoming dial-peers and outgoing dial-peers in their order of preference?
- What are user facing features?
- What is Extension Mobility?
- What is Call Park?
- What is PLAR?
- What is ISDN and Q.931?
- What is the use of NTP?
- What is BAT in case of CUCM?
- What is the difference between phone button template and soft-key template?
- What is the difference between LDAP synchronization and LDAP Authentication?
- Explain various ways in which Cisco unified communication systems can be deployed?
- What is line group in CUCM?
- What are the different ways in which we can add phones in CUCM?
- Which signaling protocols can be used for integration between CUCM and CUC?
- What are the various ways in which we can add users in CUCM?
- What is Mobile Voice Access and Unified mobility?
- What are the different call flows supported in H323?
- What is fast start and slow start? Explain the difference between them.
- What is early media? Explain the call flow.
- What are TCS and OLC in H323?
- What is the difference between early offer and delayed offer?
- Which protocol does Q931 backhauling and what does it mean?
- What is SDP? Which signaling protocols use it?
- What is silence suppression?
- What is use of region in CUCM?
- What do you mean by default dial-peer?
- What is AAR?
- What is SRST and MGCP fall-back?
- In which situation do we not require MGCP fall-back configuration with SRST configuration?
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