SIP Trunking for Call Centers
SIP trunking for call centers from Connectivity King connects your Vicidial, GoAutoDial, Asterisk/FreePBX or 3CX system to Tier-1 carrier routes, with STIR/SHAKEN-signed outbound calls and a network built for 99.99% uptime. Turn-up usually takes under an hour, and quotes usually come back the same day. Long live the dial tone.
What is SIP trunking?
A SIP trunk is your call center’s voice connection over the internet, and the core of any call center VoIP setup. Your dialer or PBX hands calls to our network, and we carry them to the phone network, with no physical lines to order and no hardware to rack. Our trunks are built for outbound call center traffic: lots of short calls, fast call setup and dialers that pace by the second. They work with Vicidial, GoAutoDial, Asterisk/FreePBX and 3CX.
Where do your calls go?
Over Tier-1 carrier routes. USA routing is our standard service, and we offer other countries for high-volume clients. Tell us your destinations and expected volumes, and we’ll quote the routes that fit. We’d rather put your calls on a route we trust than shave a fraction off by cutting corners. Share your expected concurrent calls up front, so we can size your trunk for peak dialing, not an average Tuesday afternoon.
How fast can I be dialing?
Usually within the hour. Here’s the path from "hello" to live traffic:
- Tell us about your floor: seat count, dialer platform, destinations, expected concurrency and the caller IDs you’ll use.
- Get your quote. Pricing depends on your volume, and quotes usually come back the same day.
- Connect. Choose IP authentication (we allow your dialer’s static public IP) or registration (username and password). We share the connection details and supported codecs.
- Test together. We place test calls with you before production traffic. Turn-up usually takes under an hour.
- Scale. Add capacity, destinations or DID numbers as your campaigns grow.
How does it fit into my stack?
| Platform | Where the trunk goes |
|---|---|
| Vicidial | Admin → Carriers: account entry, globals string and dialplan entry |
| GoAutoDial | The carrier settings in the GoAutoDial admin |
| Asterisk / FreePBX | A PJSIP trunk plus your outbound routes |
| 3CX | A SIP trunk set up as a generic provider |
Setting up Vicidial yourself? Follow our guide to adding a SIP trunk carrier in Vicidial. Still on chan_sip? See migrating Vicidial carriers to PJSIP. Rather skip the server work entirely? Our hosted Vicidial dialer comes with our trunks already connected.
Which caller IDs can I send?
Only numbers you own or are authorized to use. DIDs from Connectivity King get A-level attestation and work as caller ID right away. Want to use a number from another provider? Our support team confirms your authorization before we enable it. Signing helps receiving carriers authenticate your calls, but reputation still comes down to how you call: consent, clean lists and sensible pacing. Our guide Does STIR/SHAKEN Stop Spam Labels? explains the difference.
Key features
- Tier-1 carrier routes, with USA routing standard and other countries for high-volume clients
- Outbound calls signed with STIR/SHAKEN, with A-level attestation on Connectivity King DIDs
- Works with Vicidial, GoAutoDial, Asterisk/FreePBX and 3CX
- IP authentication or registration
- Turn-up usually under an hour
- 99.99% network uptime
- Caller-ID reputation monitoring
- Local and toll-free DIDs, plus number porting, on the same account
- Volume-based pricing, with quotes usually the same day
- Human support Monday to Friday, 9am ET to 9pm PT
Who it’s for
Connectivity King SIP trunks are for teams that run their own dialer or PBX and want carrier-grade routes behind it:
- Outbound call centers on Vicidial or GoAutoDial
- BPOs running several client campaigns, each with caller IDs they’re authorized to use
- Asterisk/FreePBX and 3CX teams moving from physical lines to SIP
- Call centers outside the US that call US numbers. You can sign up from anywhere.
- High-volume operations that need routes beyond the USA
Compliance: You are responsible for complying with all applicable laws and regulations, including the TCPA, state and federal Do Not Call (DNC) rules, and obtaining proper consent before dialing. Connectivity King provides connectivity and tools; lawful use is the customer’s responsibility.
Frequently asked questions
What is SIP trunking?
Do your SIP trunks work with Vicidial?
Which countries can I call?
How much does SIP trunking cost?
Are outbound calls signed with STIR/SHAKEN?
What support do you offer?
Ready to get connected?
Tell us about your call center and we’ll match you to the right routes — quotes usually same day.
Request a quote