Guides, technical deep-dives, and industry insights.
SD-WAN vendors promise MPLS-like voice quality over broadband. Here's what the technology genuinely does for VoIP, what it can't fix, and how to test it.
How SIP call transfer really works: the REFER method, blind vs attended flows, the Replaces header, NOTIFY progress reports, and why transfers fail.
VoIP certificate expiration causes silent registration failures, one-way audio, and stalled provisioning. Where certs hide, how they fail, and what to do.
IPv6 now carries half of Google's traffic, yet VoIP remains stubbornly IPv4. Why SIP resists the transition, where dual-stack breaks calls, and what to test.
RTCP runs alongside every RTP stream, reporting packet loss, jitter, and round-trip time. What sender and receiver reports contain, and where the data goes.
A session border controller sits between your phone system and the internet. What SBCs actually do, how they differ from SIP ALG, and who really needs one.
A 10-part series covering everything from how traditional phone calls work to diagnosing VoIP quality problems. Start here if you want to understand voice quality from first principles.
A 12-part plain language guide to business internet for people who just want their phones to work. Connection types, SLAs, redundancy, and how to choose the right provider.
A 12-part series that takes you from understanding what SIP is to reading packet captures and diagnosing real call problems. Covers message anatomy, call flows, registration, NAT traversal, security, trunking, and troubleshooting.
A 12-part VoIP troubleshooting guide covering the most common call quality problems. Symptom-based diagnosis for choppy audio, one-way audio, dropped calls, echo, caller ID issues, and more.
An 8-part guide to moving your business phone system to a new office. Covers ISP selection, building infrastructure, number porting, overlap periods, move day execution, and post-move verification.
A 20-part series for managed service providers adding voice to their stack. Covers business evaluation, network assessment, deployment, ongoing management, advanced architectures, and regulatory compliance.
A 10-part series on the internal network layer that makes or breaks your call quality. Covers switches, VLANs, QoS, cabling, routers, WiFi, PoE, and knowing when to upgrade.
SD-WAN vendors promise MPLS-like voice quality over broadband. Here's what the technology genuinely does for VoIP, what it can't fix, and how to test it.
How SIP call transfer really works: the REFER method, blind vs attended flows, the Replaces header, NOTIFY progress reports, and why transfers fail.
VoIP certificate expiration causes silent registration failures, one-way audio, and stalled provisioning. Where certs hide, how they fail, and what to do.
IPv6 now carries half of Google's traffic, yet VoIP remains stubbornly IPv4. Why SIP resists the transition, where dual-stack breaks calls, and what to test.
RTCP runs alongside every RTP stream, reporting packet loss, jitter, and round-trip time. What sender and receiver reports contain, and where the data goes.
A session border controller sits between your phone system and the internet. What SBCs actually do, how they differ from SIP ALG, and who really needs one.
Five VoIP failover architectures ranked by cost and complexity. From simple call forwarding to geo-redundant SIP trunks, with the tradeoffs nobody mentions.
A speed test cannot diagnose VoIP problems. Here is the testing methodology that gives you real jitter, packet loss, and MOS numbers you can use to fix issues and justify changes.
Step-by-step QoS configuration for VoIP on Ubiquiti, Fortinet, and Meraki. DSCP marking, queue disciplines, and how to verify it is actually working.
Wi-Fi 6 and mesh systems do not solve VoIP quality problems at home. Here is what actually matters for reliable calls from a home office, and how to test it.
STIR/SHAKEN was supposed to stop caller ID spoofing. Robocalls barely decreased. Here is why the framework has not delivered on its promise and what businesses can actually do.
AI voice bots generate call patterns that break traditional capacity planning. Here is what changes when automated agents share your SIP trunks with human callers.
SIP traces are text-based and readable, but finding the problem in hundreds of messages is overwhelming. A practical guide to cutting through the noise and getting to the answer fast.
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.
How to capture VoIP traffic with Wireshark, filter for SIP and RTP, extract call quality metrics, and diagnose common problems like one-way audio and codec mismatches.
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.
Step-by-step guide to capturing SIP and RTP traffic with Wireshark, filtering for VoIP calls, and analyzing the results. Includes where to capture, what filters to use, and how to extract useful data from a pcap file.
SIP ALG rewrites VoIP signaling as it crosses your router and almost always makes things worse. How to check if it is enabled and what to do instead.
How T.38 fax relay works, how it differs from fax passthrough, the SIP re-INVITE flow that sets it up, and why T.38 still breaks so often in production.
G.711, G.729, Opus, and the other codecs that shape VoIP call quality. How they work, what they trade off, and why the same network sounds different with each codec.
Pre-deployment VoIP checklist: internet quality validation, LAN readiness, firewall rules, DNS, failover, and test call procedures to run before go-live.
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.
Using Wireshark and packet captures for VoIP troubleshooting: where to capture, what to look for in SIP and RTP streams, and connecting packets to symptoms.
Federal and state call recording consent laws: one-party vs two-party rules, interstate complications, and what VoIP platforms need to account for.
Fax machines, fire panels, elevator phones, and security systems were built for analog circuits. Converting them to VoIP ranges from difficult to prohibited by code.
Lines, trunks, key systems, and line appearances don't map cleanly to VoIP. What replaced them, and why the old mental model causes so much confusion.
How VoIP trunk providers overbook capacity, what happens when they hit limits, how to spot overbooking as the cause of intermittent quality issues, and what to ask before signing.
How SIP over WebSockets enables browser-based VoIP, how the media path works, and how browser softphones connect to traditional phone infrastructure.
The mechanics of phone number porting: LOA, LSR, FOC process, how the NPAC routes calls after activation, why ports fail, and how to avoid common problems.
How SRTP encrypts VoIP media streams, the three key exchange methods (SDES, DTLS-SRTP, ZRTP), and why encryption failures cause confusing interop problems.
AT&T begins decommissioning copper in hundreds of wire centers starting mid-2026. If you still have POTS lines for fax, fire alarms, or elevators, here is what to do before they go dark.
How VoIP systems use DNS to find servers, why SRV and NAPTR records matter, and why DNS failures cause some of the most confusing phone outages you will encounter.
Speed tests measure the wrong things for voice traffic. Here are the specific gaps between what a throughput test reports and what VoIP actually needs to sound good.
What actually happens to your VoIP phones during an internet outage, and how to set up your system so a failure does not mean total phone silence.
A complete, plain-language walkthrough of everything that happens between tapping a contact on your phone and the other person hearing your voice. Every step, from microphone to speaker.
Packet loss is the most common cause of poor VoIP call quality. What causes it, how to measure it, and how to fix it at each point in the network path.
Remote work put VoIP on home networks where IT has no visibility. Learn what to monitor and how to maintain call quality.
Wi-Fi introduces real problems for VoIP calls. A practical breakdown of when wireless works, when it fails, and how to fix it.
MOS is the standard voice quality metric. Learn what it measures, how it is calculated, and what counts as a good score.
Jitter causes choppy VoIP calls even on fast connections. Learn what jitter is, how it affects call quality, and how to fix it.