Which Verizon products are supported?

Verizon Business SIP Trunking, Verizon IP Trunking, and most Verizon Business voice products. The integration pattern is SBC + SIP entity for Open behind your PBX.

Do I have to change my Verizon contract?

No. The Verizon-side configuration stays exactly as it is.

Can I keep my numbers?

Yes. All Verizon-supplied numbers stay on Verizon.

E911 routing stays on Verizon, fully unchanged. The AI never initiates 911 calls itself.

Yes — for any Verizon SIP trunk, an SBC is the standard mediation layer.

Can the AI escalate to my PBX agents?

Yes. SIP REFER returns the call via the SBC into the PBX with the transcript attached.

What does this cost on top of Verizon?

Verizon keeps invoicing carrier minutes. Open charges per resolved conversation.

How long does setup actually take?

30–60 minutes — mostly PBX/SBC change-control.

SIP Trunk

Open for Verizon Business

Pair Open with Verizon Business SIP via your SBC and the AI picks up — Verizon keeps the carrier role, E911, and your existing numbers.

Try now

Setup time: 30–60 minutes
Auth: SBC pairing (TLS + IP allowlist)
Directions: Inbound · Outbound · Call transfer
Pricing: Included with Open

01 — Overview

Can I add an AI phone agent to my Verizon Business SIP setup?

Yes. Verizon Business SIP Trunking and IP Trunking products terminate on your SBC; Open joins as a SIP destination behind that SBC. Your Verizon contract, numbers, and E911 stay where they are.

Verizon Business remains your Tier-1 carrier. Numbers, E911 records, regulatory compliance, and PSTN reach all stay with Verizon. Open joins as a SIP destination on the trusted side of your SBC — the SBC keeps Verizon-side signaling mediated, and Open lives behind it. The PBX you run (typically Avaya, Mitel, Cisco, 3CX, or a hosted Cloud PBX) decides which calls hand off to AI.

For inbound, the call lands on Verizon, traverses the SBC into your PBX, and at the point you want AI to take over the PBX routes the call to Open's SIP entity (also configured behind the SBC). Verizon owns the carrier leg; the PBX makes the routing decision; Open answers.

For outbound, Open opens a SIP session against the SBC using a service-account credential, and the SBC forwards to Verizon. Verizon-side billing sees regular outbound minutes; Open never marks them up. Caller IDs are constrained to whatever Verizon has approved on the trunk.

What the AI does on the call: it listens, reasons over your knowledge base and connected tools, and acts. When the AI needs a human, it warm-transfers back via SIP REFER through the SBC into your PBX, which routes to a queue or skill with the live transcript attached.

E911 stays on Verizon. The AI does not initiate 911 calls; if a customer asks for emergency help, the AI warm-transfers to a human and passes through emergency intent to your existing E911 path.

What stays the same on Verizon Business

Verizon-supplied numbers
DIDs, toll-frees, and regulatory records stay on Verizon.
Verizon contract and pricing
Your Verizon Business SIP / IP Trunking contract doesn't move.
Existing SBC
Your SBC keeps mediating Verizon-side signaling.
E911 routing
Emergency calls keep using your Verizon-side E911.

What's new with Open

A SIP entity behind the SBC
Open's SIP URI becomes a destination on the trusted side of your SBC.
PBX-side routing change
Your PBX routes opted-in calls to the Open SIP entity.
AI handles the conversation
On opted-in branches, the AI greets, listens, calls your tools, and replies in natural speech.
Pricing model
Open per resolved conversation. Verizon keeps invoicing carrier minutes.

02 — Why this works

The native Verizon Business experience

Verizon contract untouched
Your Verizon Business agreement doesn't change. Open just rides on the trusted side of your SBC.
E911 stays on Verizon
Emergency routing remains on the carrier side — the AI never initiates 911 calls itself.
Per-PBX-route opt-in
Pick exactly which PBX hunt groups, ACD paths, or queues route to AI.
Warm transfer back to your PBX
AI escalations come back via SIP REFER through the SBC into your PBX with the transcript attached.

03 — Setup guide

Wire up Verizon Business in 30–60 minutes

Two trunks — one inbound, one outbound. Both configurable from Settings → SIP in the Open dashboard.

1
Open Settings → SIP
Open the inbound trunk configuration.
2
Pick a SIP region
Choose Global or US.
3
Copy the SIP credentials
Grab the SIP endpoint, username, and password.
4
Add a SIP entity behind your SBC
On the trusted side of the SBC, configure Open's SIP host as a SIP entity / trunk.
5
Wire your PBX to route opted-in calls
In your PBX, add a hunt group / ACD path that routes to the new SIP entity for opted-in branches.
6
Add the matching numbers to Open
Under Phone Number (DID), add the Verizon DIDs that fronted the PBX route.
7
Assign numbers to an AI agent
Channels → Phone → Agents → assign DIDs.
8
Place a test call
Dial a Verizon-supplied number, take the AI branch, and confirm Open answers.

04 — Configuration

Settings → SIP, at a glance

A real inbound trunk for Verizon Business looks something like this. Yours are generated when you open Settings → SIP.

SIP entity · Verizon Business

Sample

Carrier: Verizon SIP / IP Trunking
Open SIP host: sip.us.opencx.comUS region
Transport: TLSrecommended
Auth: TLS + IP allowlist (SBC)
E911 routing: On Verizonunchanged

05 — Security

Encrypted, audited, refundable

SIP over TLS for signaling, SRTP for media. Every call is logged with full reasoning traces. SOC 2 Type II, GDPR-aligned, HIPAA- and PCI-ready. Backed by the Open $2M Refund Guarantee.

06 — FAQ