Starting a new setup?
Choose authentication, destinations, numbers and rate controls before the first business calls leave your platform.
Product / SIP Trunking & Outbound Calling
Global SIP trunking for a new or existing voice setup.
Connect a PBX, dialer, call centre or voice application to international inbound and outbound calling. Start with one route, add DIDs and routing controls, then expand when the setup proves useful.
Starting outbound rateFrom $0.0021/minute
AuthenticationSIP credentials or IP-based authentication
Works withPBX, switch, IP phone, dialer, AI voice agents
Already operating?
Add a country, test an alternative carrier, connect an existing PBX or set up a backup route without a forced full migration.
Fraud protection
Controls that protect outbound calling spend.
A1ROUTES SIP trunking includes practical account controls that help prevent compromised credentials, unwanted destinations, and unexpectedly expensive outbound calls.
Disable outbound SIP credentials
Prevent compromised SIP credentials from generating outbound traffic by disabling credentials and using IP-based authentication.
Maximum outbound rate
Block any outbound call if it exceeds a predefined rate in your control panel.
Destination restriction
Block or whitelist destinations by country or number prefix.
Low balance alert
Receive email alerts when your account balance hits a specific limit.
Bring your own device
Use any SIP-compliant PBX, switch, IP phone, or compatible endpoint.
Global outbound coverage
Use one A1ROUTES account for sales, support, research, education, insurance, travel, and AI voice traffic.
★★★★★
“We've relied on A1ROUTES for our global market research outbound calling for over a decade. What's kept us there is simple — when something goes wrong, a real person picks it up and routes get fixed fast.”
Nisarg Bhatt, Partner — ActionEdge
Do I need to move every route to A1ROUTES?
No. Many teams start with one destination, one DID group, one campaign or a backup path.
Can I use my current PBX?
Yes. A1ROUTES can work with SIP-compliant PBX, switch, dialer and voice-platform environments.
Can SIP cause codes help campaign operations?
They can provide better visibility into failed-call patterns so teams can separate data, configuration and temporary routing issues more clearly.
Compatible with common SIP PBX environments
SIP trunking for existing PBX systems
A1ROUTES supports SIP trunking for common SIP-compliant PBX environments, including Avaya, Cisco, 3CX, FreePBX, FusionPBX, Asterisk, FreeSWITCH, Yeastar, Grandstream, Issabel, and other platforms.
Use A1ROUTES for global DIDs, outbound termination, backup routes, caller ID strategy, and routing support while keeping your existing PBX in place.
Logos are shown for compatibility reference only. A1ROUTES is not claiming partnership, endorsement, or certification by these vendors unless explicitly stated.
Outbound rates
International outbound calling rate sheet
Search reference rates by destination, then test the route that matters to your operation.
SIP trunk enquiry
Test a route around the work your team does.
Share your platform, destinations and call pattern. We will help you choose a practical starting route.