VoIP Technology & Protocols Flashcards
6 cards from real Phone Service Business practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 VoIP Technology & Protocols flashcards as text
What is latency in a VoIP call, and what is considered an acceptable one-way delay?
Answer: The delay between speaking and hearing; under 150ms is ideal per ITU-T
Latency is the one-way delay in a VoIP call; the ITU-T recommends keeping it under 150ms for acceptable call quality.
What does QoS (Quality of Service) do in a network supporting VoIP?
Answer: Prioritizes voice traffic over other data to reduce latency and jitter
QoS settings on a network router prioritize voice packets to ensure consistent, high-quality VoIP calls even during high data usage.
What is packet loss in VoIP and what percentage is generally considered problematic?
Answer: Lost audio data packets; above 1-3% noticeably degrades call quality
Packet loss above 1-3% in VoIP causes audible gaps or clipping because lost audio packets cannot be retransmitted in real time.
Which port does SIP most commonly use for signaling traffic?
Answer: Port 5060
SIP signaling traffic typically uses UDP or TCP port 5060, and port 5061 for TLS-encrypted SIP.
What is SRTP used for in a VoIP deployment?
Answer: Encrypting voice media streams to prevent eavesdropping
SRTP (Secure Real-time Transport Protocol) encrypts VoIP audio streams to protect them from interception.
What is a codec in the context of VoIP?
Answer: Software that compresses and decompresses audio for transmission
A codec (coder-decoder) encodes audio signals for transmission and decodes them at the receiving end during a VoIP call.