Setup & Troubleshooting ·
SIP Error Codes 401, 403, 404, 408, 480, 486, 503: Causes and Fixes
What each response really means on a trunk, where to look in the trace, and the fix that usually works.
Blog category
Setup & Troubleshooting
PBX configuration, SIP error codes and fixing audio problems.
4 articles
Setup & Troubleshooting ·
Connect a SIP Trunk to Asterisk (PJSIP) Step by Step
pjsip.conf for IP auth and registration, dialplan and first-call testing.
Setup & Troubleshooting ·
Add a SIP Trunk to 3CX
Generic SIP trunk settings, outbound rules and caller ID in 3CX.
Setup & Troubleshooting ·
One-Way Audio on VoIP Calls: 9 Causes and How to Fix Them
NAT, RTP port ranges, SIP ALG and the other usual suspects.