Add a SIP trunk

Connect 3CX to your phone line provider.

What you need	Affects
Admin access to the 3CX Admin Console, and the SIP details from your provider (trunk number, username, password and server)	All outside calls

1. Add the trunk

Open Voice & ChatIn the Admin Console, open Voice & Chat and click Add Trunk.
Choose your providerSelect your country, then your provider. If it isn't listed, choose Generic SIP Trunk.
Enter the main numberEnter the trunk's main phone number.
Enter the loginType the username (authentication ID) and password exactly as your provider gave them.
SaveClick Save. The trunk should turn green on the dashboard within a minute.

List your DIDsOpen the trunk and add each phone number (DID) on the account, so 3CX knows which numbers it can receive.
Route the callsSet where calls to each number go. See "Route incoming calls".

Call your main number from a mobile, then make an outside call from a desk phone to check both directions work.

Problem	Likely cause and fix
The trunk stays red	Re-check the username and password, then confirm with your provider that the account is active.
Incoming calls are rejected	The number isn't listed as a DID on the trunk, or it's in a different format. Add it as your provider sends it.
Outside calls fail	Check an outbound rule uses this trunk.

Some providers need extra settings, such as a registrar or outbound proxy. Use their 3CX setup guide if they have one.