VICIdial SIP trunk docs & guides.
Reference material for the people who configure and run carrier-grade voice. Start here if you are wiring a VICIdial SIP trunk for outbound calling, picking a codec, or learning the standards behind every call on the SIPNEX network.
The guides below cover three layers. References (E.164, SIP response codes, DTMF) explain what is happening on the wire. Setup guides for VICIdial, Asterisk, and FreePBX ship tested templates — including IP-based auth, where we whitelist your server's public IP address instead of a password. Troubleshooting guides cover SIP ALG, 603 rejections, and packet loss.
Each guide is written for the person doing the work — dialer operators, call center admins, and PBX engineers. Missing something? Email contact@sipnex.ca and we will answer it or add it to the library. Need help beyond the written guides? Our engineers answer during business hours — not a tier-1 helpdesk, the person who can actually open the config.
Browse the library.
VICIdial SIP Trunk Setup
Complete walkthrough — the Admin → Carriers entry, sip.conf, extensions.conf, codec negotiation, outbound routes, attestation handoff.
SIP Trunk Configuration
Step-by-step SIP trunk configuration for Asterisk and FreePBX with tested templates and common pitfalls.
E.164 Number Format
The international phone number standard — why normalization matters and how SIPNEX expects numbers on every API call.
SIP Response Codes
The operator's reference — every class from 1xx to 6xx, the codes trunks actually return, and what each one tells you.
SIP Code 603 / Network Blocked
What a 603 means since the FCC's 603+ standard took effect — reading the Reason header and the redress path.
SIP ALG Explained
Why the router feature meant to help SIP breaks it instead — symptoms, the mechanism, and the per-router disable table.
DTMF Tones
The tone matrix, RFC 4733 vs inband vs SIP INFO, and why IVR digits fail on compressed codecs.
Fix Packet Loss
Symptom triage for choppy audio, the diagnosis workflow, and fixes ranked by effort — QoS, bufferbloat, WiFi.
Need help configuring?
Call (833) 665-2220 during business hours. The engineer on the line has run the platform you are configuring.