Posts in troubleshooting.
A detailed walkthrough of what one-way audio looks like at the packet level. Follow a real SIP call from INVITE to media flow and see exactly where the audio path breaks down.
Fast internet does not mean good VoIP. A 10 Mbps connection with low jitter will outperform a 1 Gbps connection with bufferbloat. Here is why bandwidth is not your problem.
SIP ALG breaks VoIP calls on routers from Ubiquiti, Fortinet, SonicWall, TP-Link, and more. Here is how to disable it on each one, and how to prove it was the problem.
Fax machines were built for circuit-switched lines, not VoIP. Learn why faxing over IP fails and which alternatives actually work.
Static, buzzing, or humming on VoIP calls? It is usually electrical interference, bad cables, or PoE problems, not packet loss.
Internal calls sound fine but external calls are bad? The problem is between your PBX and the outside world. Here is how to find it.
VoIP calls sound worse in the afternoon? That pattern points to bandwidth saturation, ISP congestion, or peak-hour network overload.
VoIP phones not ringing for incoming calls? Check registration, ring groups, routing rules, and network issues with this guide.
VoIP audio delay causing people to talk over each other? Find the latency source and fix it with these steps.
Caller ID on VoIP travels through multiple systems that can each modify it. Here is how to trace outbound, inbound, and CNAM issues to the source.
When VoIP calls skip the phone and go straight to voicemail, the cause is usually registration, DND, forwarding, or routing. Here is how to find it.
Echo on VoIP calls comes from acoustic feedback, network hybrids, or latency-amplified reflections. Here is how to identify the type and fix it.
VoIP calls dropping at exactly 30 seconds or 15 minutes? Those patterns point to SIP timer and NAT timeout issues. Diagnose each one.
One way audio on VoIP calls is almost always a NAT or firewall issue. Here is how to find and fix the blockage so audio flows in both directions.
Choppy or robotic VoIP audio is caused by jitter and packet loss. Work through these seven checks systematically to find and fix the source.