Voice over IP (VoIP) Flashcards
6 cards from real Telecommunications practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Voice over IP (VoIP) flashcards as text
What is the purpose of a jitter buffer in VoIP?
Answer: Store packets temporarily to reduce delivery variation
A jitter buffer temporarily stores incoming voice packets to compensate for network jitter and deliver smooth, consistent audio.
Which QoS mechanism marks VoIP packets for priority treatment?
Answer: DSCP
DSCP (Differentiated Services Code Point) marks packets in the IP header to signal routers to give them priority treatment.
What does MOS stand for in VoIP quality assessment?
Answer: Mean Opinion Score
MOS (Mean Opinion Score) is a numerical measure of voice call quality, rated from 1 (bad) to 5 (excellent).
What is a SIP trunk?
Answer: A virtual connection linking a PBX to a carrier's SIP network
A SIP trunk is a virtual connection between an IP-PBX and an ITSP (Internet Telephony Service Provider) for making and receiving calls.
What protocol is used for delivering voicemail notifications to IP phones?
Answer: NOTIFY via SIP
SIP NOTIFY messages are used to send message waiting indicator (MWI) notifications to IP phones about new voicemails.
What type of address uniquely identifies a SIP endpoint?
Answer: SIP URI
A SIP URI (Uniform Resource Identifier) identifies a SIP endpoint, formatted similar to an email address (e.g., sip:user@domain.com).