Which Layer 4 transport protocol is MOST commonly used for Session Initiation Protocol (SIP) signaling on the default port 5060 in typical VoIP deployments?
UDP
TCP
ICMP
SCTP
SIP supports several transport protocols-including UDP, TCP, and SCTP-but UDP is both the default and the most widely used for unencrypted SIP signaling on port 5060. UDP's lightweight, connectionless behavior reduces latency and overhead, which benefits real-time voice and video traffic. SIP provides its own reliability mechanisms (retransmissions and acknowledgments), so it does not rely on TCP's connection-oriented features. TCP may be selected when very large SIP messages need guaranteed delivery, and SCTP is optional in certain environments.
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
All IT & Cybersecurity Package plans include the following perks and exams .
Our pricing is simple. Full access to all certifications and exams in each package, for one price.
As many practice tests for as many topics as you want.
Use study mode non-stop, no limits.
Access to our AI assistant, Bash, trained to help you pass your exam.
Track your scores over time in study mode and report cards.
See how you improve over time, and where you need to focus.
Access our store with even bigger discounts than before.
Unlimited access to all performance questions and be prepared for the real thing.
All IT & Cybersecurity Package plans include unlimited access to the following study materials.
Create an account or sign in to access our study materials.