Business Phone Systems Knowledge Assessment — Questions and Answers

Question 1: What does setting a 'max call duration' limit on outbound calls accomplish?

Limits how long employees can talk before being scored negatively
Restricts the number of calls an extension can make per hour
Automatically disconnects calls that exceed a specified time limit to prevent runaway billing (Correct answer)
Sets the maximum ring time before sending to voicemail

Correct answer: Automatically disconnects calls that exceed a specified time limit to prevent runaway billing

A max call duration setting prevents unexpectedly long or abandoned calls from accumulating excessive charges on the phone bill.

Question 2: What is least-cost routing (LCR) in a PBX?

Prioritizes local calls over long-distance ones
Selects the shortest call path to reduce latency
Assigns the fewest minutes to low-priority departments
Automatically routes outbound calls over the cheapest available carrier or trunk (Correct answer)

Correct answer: Automatically routes outbound calls over the cheapest available carrier or trunk

LCR analyzes available carriers and routes each outbound call through the option with the lowest per-minute cost.

Question 3: What tool can be used to capture and analyze SIP and RTP packets to diagnose VoIP issues?

Nmap
Traceroute
Wireshark (Correct answer)
Ping

Correct answer: Wireshark

Wireshark captures network packets and has built-in VoIP analysis tools that can decode SIP signaling and reconstruct RTP audio streams.

Question 4: What is the purpose of configuring a music-on-hold source?

Signals to the PBX that a transfer is in progress
Provides background music for the office through the phone system
Plays audio to callers while they are placed on hold so they know the call is still connected (Correct answer)
Plays recordings to train new agents between calls

Correct answer: Plays audio to callers while they are placed on hold so they know the call is still connected

Music on hold reassures callers that they are still connected and have not been disconnected while waiting for an agent.

Question 5: Which transport protocol do most VoIP systems prefer for carrying RTP media?

TCP
UDP (Correct answer)
SCTP
HTTP

Correct answer: UDP

UDP is preferred for RTP media because its low overhead suits real-time audio better than TCP's retransmission delays.

Question 6: What is a codec in the context of VoIP?

A firewall rule for voice traffic
A type of network switch
A device that compresses and decompresses audio data (Correct answer)
A billing software module

Correct answer: A device that compresses and decompresses audio data

A codec compresses and decompresses audio data to reduce bandwidth usage while maintaining call quality.

Question 7: What is call recording compliance primarily important for in the US?

Compliance only applies to calls over 10 minutes
US law mandates recording all business calls
Recording is only required for international calls
Industries like finance and healthcare must record calls to meet regulatory requirements such as MiFID II, HIPAA, and Dodd-Frank (Correct answer)

Correct answer: Industries like finance and healthcare must record calls to meet regulatory requirements such as MiFID II, HIPAA, and Dodd-Frank

Regulated US industries including finance, healthcare, and legal services must record and retain calls to comply with federal and state regulations.

Question 8: What is a phone system's user portal (as distinct from the admin portal)?

A hardware configuration tool for desk phones
A billing management interface for the account owner
A self-service web interface where individual employees manage their own voicemail, forwarding, and preferences (Correct answer)
The central administration dashboard for IT staff

Correct answer: A self-service web interface where individual employees manage their own voicemail, forwarding, and preferences

The user portal gives employees control over their personal settings like call forwarding rules, voicemail greetings, and notification preferences.

Question 9: What does enabling 'call waiting' on a business extension allow?

Puts the first caller on hold while a second call is answered automatically
Forwards second calls directly to voicemail
Queues additional callers until the current call ends
Notifies a user already on a call that a second call is incoming so they can switch between calls (Correct answer)

Correct answer: Notifies a user already on a call that a second call is incoming so they can switch between calls

Call waiting generates an audible or visual notification of a second incoming call while the extension is busy on another call.

Question 10: What does the term 'extension' mean in a PBX context?

A hardware add-on card for the PBX chassis
An internal phone number assigned to an employee or device within the PBX (Correct answer)
An additional physical phone line from the carrier
A license upgrade for the PBX software

Correct answer: An internal phone number assigned to an employee or device within the PBX

An extension is a short internal number assigned to a user or device that allows internal calls without using external phone lines.

Question 11: What is DNIS (Dialed Number Identification Service)?

A caller ID display format
A voicemail notification service
A feature that tells the receiving PBX which number the caller dialed (Correct answer)
A DDoS protection mechanism for PBX systems

Correct answer: A feature that tells the receiving PBX which number the caller dialed

DNIS delivers the destination phone number to the PBX so it can route the call appropriately to the correct department or IVR.

Question 12: What is a DID (Direct Inward Dialing) number?

A dial code for outbound international calls
A voicemail box identification number
A hardware interface on a PBX chassis
A phone number that routes directly to a specific extension without going through an operator (Correct answer)

Correct answer: A phone number that routes directly to a specific extension without going through an operator

DID allows external callers to reach a specific employee extension directly by dialing their assigned phone number.

Question 13: What is number verification or caller ID authentication (STIR/SHAKEN) in US telephony?

A framework that digitally signs and verifies caller ID to combat spoofed robocalls (Correct answer)
A two-factor authentication system for accessing the phone system admin portal
A process that confirms a new phone number is not already in use
An FCC regulation requiring businesses to verify employees' phone use

Correct answer: A framework that digitally signs and verifies caller ID to combat spoofed robocalls

STIR/SHAKEN is an FCC-mandated framework where carriers cryptographically sign caller ID information to verify it has not been spoofed.

Question 14: What is a SIP registrar server?

A hardware device that bridges SIP to PSTN calls
A cloud database of all business phone numbers
A server that authenticates and tracks the current IP address of SIP devices so calls can be routed to them (Correct answer)
A server that stores voicemail messages

Correct answer: A server that authenticates and tracks the current IP address of SIP devices so calls can be routed to them

The SIP registrar accepts REGISTER requests from SIP phones, storing their current IP location so the system knows where to send incoming calls.

Question 15: What is a hunt group (ring group) in a PBX?

A group of fax machines sharing one line
A set of extensions that ring sequentially or simultaneously when a specific number is dialed (Correct answer)
A security feature that blocks unwanted callers
A method to route international calls cheaply

Correct answer: A set of extensions that ring sequentially or simultaneously when a specific number is dialed

A hunt group distributes incoming calls to a defined set of extensions either one at a time or all at once until someone answers.

Question 16: What is the recommended approach when a firmware update breaks IP phone functionality?

Disable auto-update and leave the broken firmware in place
Replace the phone with a newer model
Roll back to the previous stable firmware version from the manufacturer's portal (Correct answer)
Factory reset the phone and re-provision it with the new firmware

Correct answer: Roll back to the previous stable firmware version from the manufacturer's portal

Rolling back to a known-good firmware version is the fastest way to restore functionality while the manufacturer investigates the problematic update.

Question 17: What does 'follow-me' call routing do?

Plays a custom hold message based on caller origin
Rings a sequence of phone numbers until the call is answered or goes to voicemail (Correct answer)
Forwards all calls to a single backup number
Automatically records all incoming calls

Correct answer: Rings a sequence of phone numbers until the call is answered or goes to voicemail

Follow-me routing rings multiple numbers in a defined sequence — such as desk phone, then mobile — so users never miss a call.

Question 18: What is a whisper announcement in a call center context?

A recording played to callers while they wait in queue
A notification sent to agents' computers when a call arrives
A feature that lets supervisors speak to agents without callers hearing
A brief audio message played to the agent before the caller is connected, providing context about the call (Correct answer)

Correct answer: A brief audio message played to the agent before the caller is connected, providing context about the call

A whisper announcement plays a short message in the agent's ear just before connection, such as which campaign or number the caller dialed.

Question 19: What does 'number portability' allow a business to do when switching cloud phone providers?

Forward calls internationally without extra charges
Keep existing phone numbers when moving to a new service provider (Correct answer)
Assign temporary numbers during service outages
Use one number across multiple devices simultaneously

Correct answer: Keep existing phone numbers when moving to a new service provider

Number portability (LNP — Local Number Portability) lets businesses transfer their existing phone numbers to a new carrier.

Question 20: How are Call Detail Records (CDRs) used for security monitoring on business phone systems?

They automatically route calls to the most available agent
They log call metadata to help detect anomalous patterns that may indicate fraud or unauthorized access (Correct answer)
They improve call audio clarity and reduce latency
They provide accurate per-minute billing for customer invoices

Correct answer: They log call metadata to help detect anomalous patterns that may indicate fraud or unauthorized access

CDRs capture metadata (caller, recipient, time, duration, cost) for every call, allowing administrators to identify unusual spikes or patterns that may signal toll fraud or a compromised account.

Question 21: What is the primary security function of a Session Border Controller (SBC) in a VoIP environment?

To convert analog phone signals to digital format
To route calls between multiple offices simultaneously
To provide security, interoperability, and control at the border of a VoIP network (Correct answer)
To record all inbound and outbound phone calls

Correct answer: To provide security, interoperability, and control at the border of a VoIP network

An SBC acts as a security and policy enforcement point at the network border, protecting against DoS attacks, unauthorized access, and interoperability issues between different VoIP systems.

Question 22: What is auto-provisioning (zero-touch provisioning) for IP phones?

A system that orders replacement phones when one fails
The phone automatically downloads its configuration from a provisioning server when plugged in (Correct answer)
A feature that assigns extensions automatically to new employees
Automatic firmware updates for all IP phones overnight

Correct answer: The phone automatically downloads its configuration from a provisioning server when plugged in

Auto-provisioning lets IP phones fetch their configuration files from a server at boot, eliminating manual setup of each device.

Question 23: What is call screening?

Routing calls based on the originating area code
Blocking known spam callers automatically
Recording calls for quality assurance review
Announcing the caller's name or number to the recipient before they accept the call (Correct answer)

Correct answer: Announcing the caller's name or number to the recipient before they accept the call

Call screening announces who is calling so the recipient can decide whether to answer, send to voicemail, or take a message.

Question 24: What is the recommended best practice for securing administrator access to a business VoIP phone system?

Sharing admin credentials among all IT staff members
Using the manufacturer's default password for simplicity
Enabling multi-factor authentication combined with a strong password policy (Correct answer)
Disabling all remote administrative access permanently

Correct answer: Enabling multi-factor authentication combined with a strong password policy

Multi-factor authentication plus strong passwords significantly reduces the risk of unauthorized administrative access, which is especially critical for VoIP systems that can be used for toll fraud.

Question 25: What does 'hot desking' mean in the context of business phones?

Rapidly deploying new phone hardware to a workstation
A shared physical phone that rings for multiple departments
A feature that automatically adjusts call routing during peak hours
An employee can log into any available desk phone and have it configured as their personal extension (Correct answer)

Correct answer: An employee can log into any available desk phone and have it configured as their personal extension

Hot desking allows mobile workers to sit at any available desk and log into the IP phone there to get their personal extension and settings.

Question 26: What does it mean when a SIP phone shows 'Registration Failed'?

The phone number has been disconnected by the carrier
The phone's hardware warranty has expired
The phone's SIP license has not been activated
The phone cannot authenticate with the SIP registrar, usually due to wrong credentials, server address, or network issue (Correct answer)

Correct answer: The phone cannot authenticate with the SIP registrar, usually due to wrong credentials, server address, or network issue

Registration failure means the SIP REGISTER request was rejected, typically because of incorrect username, password, SIP server address, or a network block.

Question 27: What is the difference between 'attended transfer' and 'blind transfer'?

Blind transfer requires supervisor approval; attended does not
Attended transfer lets you speak to the receiving party before completing the transfer; blind transfer sends the call immediately (Correct answer)
Attended transfer uses more bandwidth than blind transfer
Attended transfer only works between extensions on the same PBX

Correct answer: Attended transfer lets you speak to the receiving party before completing the transfer; blind transfer sends the call immediately

In an attended (warm) transfer the agent introduces the caller to the receiving party first; in a blind transfer the call is sent without introduction.

Question 28: What does RTP stand for in VoIP communications?

Remote Telephony Platform
Registered Trunk Protocol
Routing Transfer Protocol
Real-time Transport Protocol (Correct answer)

Correct answer: Real-time Transport Protocol

RTP (Real-time Transport Protocol) carries the actual audio and video media streams in a VoIP call.

Question 29: What is toll fraud in the context of business phone systems?

Unauthorized use of a phone system to make expensive long-distance calls at the business's expense (Correct answer)
Reselling business phone numbers to third parties
Billing errors caused by misconfigured extensions
Charging customers hidden fees on invoices

Correct answer: Unauthorized use of a phone system to make expensive long-distance calls at the business's expense

Toll fraud occurs when attackers gain unauthorized access to a business phone system and use it to place expensive calls, leaving the victim with the charges.

Question 30: What is the purpose of a STUN server in VoIP?

Provides DHCP addresses to IP phones
Routes SIP registration requests
Stores voicemail messages
Helps VoIP devices discover their public IP address and NAT type (Correct answer)

Correct answer: Helps VoIP devices discover their public IP address and NAT type

A STUN server allows VoIP clients behind NAT to discover their public IP address and port for direct media communication.

Business Phone Systems Knowledge Assessment

Evaluates knowledge of business telephony systems including VoIP, PBX configuration, call management features, and security/compliance practices. Covers the skills required to deploy, manage, and troubleshoot modern business phone infrastructure.

Questions

90 min

Time Limit

70%

To Pass

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