CONFIGURATION GUIDES

Choose your platform. Connect Sipflex.

Start with the guide written for your PBX or voice platform. Account-specific usernames, passwords and connection details are always shown in your Sipflex portal.

Asterisk and IAX2 expertise
Current FreePBX guidance
Detailed 3CX configuration
AI voice platform profiles

PRIMARY PLATFORMS

Asterisk, 3CX or FreePBX?

Choose your platform first, then the connection method you want to configure.

Asterisk

Configuration for current Asterisk systems, plus our interactive cookbook.

PJSIP registrationRecommended IP peeringFixed IP IAX2 trunkNative IAX2 Configuration cookbookInteractive

Asterisk overview

3CX

Field-by-field configuration using the 3CX Generic SIP Trunk template.

Complete 3CX setupStart here

3CX overview

FreePBX

Current FreePBX 17 guidance for both PJSIP and IAX2 connections.

PJSIP trunkRecommended IAX2 trunkAlternative

FreePBX overview

AI VOICE PLATFORMS

Use a built-in SIP profile.

One general guide covers every available profile. ElevenLabs also has a verified field-by-field configuration article.

All platform profiles

Choose Cloudonix, ElevenLabs, LiveKit, OpenAI, Retell AI, Synthflow, Twilio, Vapi or xAI in Voice → Profiles.

Use a built-in profile

ElevenLabs

Configure inbound routing, outbound authentication, optional TLS and SIP REFER transfers.

Configure ElevenLabs

GENERIC & REFERENCE

For every other SIP system.

Start with a connection method, then use the consolidated network reference or troubleshooting flow when you need a specific value.

Generic SIP registration

Connect with your Sipflex phone number or username and separate trunk password.

Registration settings

Generic SIP peering

Authenticate a production system by its fixed public IP address.

Peering settings

Choose a connection method

Compare SIP registration, IP peering, IAX2 and built-in platform profiles.

Compare connections

Network and media reference

Look up hosts, ports, codecs, packet time, DTMF, RTP, TLS and the Sipflex allow-list address.

Open technical reference

NEED TO DIAGNOSE A CALL?

Troubleshooting lives in Help.

Follow focused checks for registration, one-way audio, DTMF, call direction and unwanted SIP traffic.

Open troubleshooting

Support scope

Sipflex can confirm credentials, registration and provider-side routing. We do not configure customer devices, PBXs, firewalls, dial plans or applications.

Prepare a support request

30-DAY FREE TRIAL

Connect your system to Sipflex

Start testing with your own PBX, application or voice platform.

Start free trial

No card required.