Runs on the phone system you already have
No carrier switch, no number port. Open registers as a SIP endpoint with your provider and takes inbound calls — or places outbound ones — on the numbers you already publish.
CPaaS · Voice API
Programmable voice APIs. Open registers as a SIP endpoint and takes the leg.
Plivo
Point a Plivo XML application or Zentrunk SIP trunk at Open and the AI picks up — keeping your Plivo numbers, CDRs, and billing in place.
Learn moreSignalWire
Point a SignalWire SIP endpoint or LaML application at Open and the AI picks up — built on the same FreeSWITCH stack you already trust.
Learn moreSinch
Point a Sinch Voice application or SIP trunk at Open and the AI picks up — across Sinch's global PSTN reach.
Learn moreTelnyx
Point a Telnyx SIP Connection or Call Control application at Open and the AI picks up — on your numbers, on your private IP backbone.
Learn moreTwilio
Connect Twilio Programmable Voice or Elastic SIP Trunking and Open will answer the call, take action, and stay in your stack.
Learn moreVonage
Point a Vonage Voice API application or SIP trunk at Open and the AI picks up — in your numbers, your dashboards, your stack.
Learn moreContact Center
Contact-center platforms, where the agent sits in the existing queue and routing.
Amazon Connect
Add Open as a transfer destination in an Amazon Connect contact flow and the AI picks up — Connect keeps owning queues, agents, and metrics.
Learn moreFive9
Add Open as an external SIP destination on a Five9 skill or IVR script and the AI picks up — Five9 keeps owning campaigns, agents, and reporting.
Learn moreFreshcaller
Forward a Freshcaller IVR branch or queue to Open and the AI picks up — Freshworks keeps owning users, numbers, and Freshdesk integration.
Learn moreGenesys
Add Open as an External Transfer destination in a Genesys Architect flow and the AI picks up — Genesys keeps owning queues, skills, and reporting.
Learn moreNICE CXone
Add Open as a Studio SIP transfer in a CXone script and the AI picks up — CXone keeps owning skills, agents, and analytics.
Learn moreTalkdesk
Add Open as an External Transfer in a Talkdesk Studio Flow and the AI picks up — Talkdesk keeps owning skills, agents, and reporting.
Learn moreUCaaS
Unified comms suites — the agent answers on the same numbers your team uses.
Cisco Webex
Pair Open with Webex Calling via Local Gateway / SIP trunk and the AI picks up — Webex users, devices, and dial plans stay exactly as they are.
Learn moreGoogle Voice
Pair Open with Google Voice via SIP Link (Workspace) or via auto-attendant forwarding and the AI picks up — Google Workspace stays unchanged.
Learn moreMicrosoft Teams
Pair Open with Teams Phone via Direct Routing or Operator Connect and the AI picks up — your Teams users, numbers, and admin center stay unchanged.
Learn moreZoom Phone
Pair Open with Zoom Phone via BYOC SIP or Zoom Contact Center routing and the AI picks up — Zoom Phone stays your phone system.
Learn moreCloud PBX
Cloud phone systems. Forward a number or a ring group and the agent picks up.
8x8
Route an 8x8 queue, ring group, or Contact Center skill to Open and the AI picks up — your 8x8 environment stays unchanged.
Learn moreAircall
Forward an Aircall Smartflow branch, team, or IVR option to Open and the AI picks up — Aircall keeps owning the rest of your phone system.
Learn moreCloudTalk
Forward a CloudTalk Call Flow Designer step to Open and the AI picks up — CloudTalk keeps owning the rest of your phone system.
Learn moreDialpad
Route a Dialpad call queue, IVR option, or contact-center skill to Open and the AI picks up — Dialpad stays your phone system.
Learn moreGoTo Connect
Route a GoTo Connect dial plan node or call queue to Open and the AI picks up — your dial plan stays the source of truth.
Learn moreGrasshopper
Forward a Grasshopper extension or after-hours rule to Open and the AI picks up — Grasshopper keeps owning the rest of your phone system.
Learn moreJustCall
Forward a JustCall IVR branch, ring group, or overflow rule to Open and the AI picks up — JustCall keeps owning the rest of your phone system.
Learn moreNextiva
Route a Nextiva auto-attendant branch or call queue to Open and the AI picks up — Nextiva stays your phone system.
Learn moreOoma
Forward an Ooma Virtual Receptionist option, ring group, or after-hours rule to Open and the AI picks up — Ooma keeps owning your phone system.
Learn moreRingCentral
Route a RingCentral queue, IVR branch, or RingCX skill to Open and the AI picks up — without leaving your RingCentral admin console.
Learn moreSIP Trunk
Raw SIP trunking, for teams that already own their carrier relationship.
AT&T Business
Pair Open with AT&T Business SIP via your SBC and the AI picks up — AT&T keeps the carrier role, E911, and your existing numbers.
Learn moreBandwidth
Point a Bandwidth SIP trunk or Voice API application at Open and the AI picks up — on a Tier-1 US carrier with E911 done right.
Learn moreBT Business
Pair Open with BT Business SIP Trunking via your SBC and the AI picks up — BT keeps the carrier-of-record role and your existing numbers.
Learn moreOrange Business
Pair Open with Orange Business SIP via your SBC and the AI picks up — Orange keeps the carrier role and your existing French / European numbers.
Learn moreVerizon 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.
Learn moreLegacy / Enterprise
On-prem and enterprise PBX estates, reached over a SIP gateway.
3CX
Add Open as a SIP trunk and outbound rule in your 3CX PBX and the AI picks up — extensions, ring groups, and digital receptionists stay yours.
Learn moreAsterisk
Add Open as a PJSIP trunk and a few dialplan extensions and the AI picks up — Asterisk gives you full control over how calls hand off to AI.
Learn moreAvaya
Pair Open with Avaya Aura, IP Office, or Avaya Cloud Office via SBC + SIP and the AI picks up — your Avaya environment stays exactly as it is.
Learn moreFreePBX
Add Open as a Trunk in FreePBX and route IVR options or inbound routes to it — the AI picks up while extensions, queues, and ring groups stay yours.
Learn moreMitel
Pair Open with Mitel MiVoice Business, MiVoice Connect, or MiCloud Connect via SBC + SIP and the AI picks up — your Mitel environment stays unchanged.
Learn moreSkype
Skype and Skype for Business are being retired by Microsoft. For an AI phone agent, the modern path is Microsoft Teams Phone — Open plugs into Teams via Direct Routing or Operator Connect.
Learn moreProvider not listed?
Anything that speaks SIP will work. The list above is the set of providers we have written setup guides for, not the limit of what connects.
Learn more