VoIP and SIP guides
Practical, no-fluff explanations for fixing and planning VoIP systems.
Guide
How Much Bandwidth Does VoIP Need?
Per-call VoIP bandwidth for G.711, G.729, G.722 and Opus, including IP, UDP, RTP and Ethernet overhead, plus how to size an office internet link.
GuideHow to Fix One-Way Audio on VoIP Calls
One side can't hear the other? A step-by-step guide to fixing one-way and no-audio VoIP calls caused by NAT, SIP ALG, firewalls and wrong SDP addresses.
GuideWhat Is MOS? VoIP Call Quality Explained
MOS and R-factor explained: what the call quality scores mean, how latency, jitter, packet loss and codecs affect them, and what targets to aim for.
GuideSIP ALG: What It Is and Why to Disable It
What SIP ALG does, why it breaks VoIP calls and registrations, how to tell if it's causing problems, and how to turn it off on common routers and firewalls.