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Five9 BYO SIP and Twilio trunks

Five9 BYO SIP connects your ITSP or gateway to Five9 SBCs. Twilio termination and origination are different directions, with a strict Request-URI rule.

Learn in 5 minutes

  1. Define Five9 BYO SIP and the gateway option
  2. Separate Twilio termination from origination
  3. Keep origination URLs on the sip scheme

Visual

Request-URI matches the termination URI · study drawing · cyphermonkeylabs.com PBXTwilio INVITE 100 180 200

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Five9 is a different provider with its own BYO SIP document.

Worked example

Read the termination Request-URI The termination URI host in this lab is sbc1.example.com. What host does this INVITE use?

    Vendor menus, ports, and license names change. Confirm before relying on a sentence that is not an RFC.

    Fault

    Twilio drops the INVITE. The termination URI host is sbc1.example.com. The request targets 192.0.2.40.

    The troubleshooting document describes this drop.

    Quiz

    Five9 BYO SIP means


    Five9 also documents


    Twilio termination requires


    A Request-URI that does not reference the termination URI is


    Origination SIP URL scheme


    Origination means


    Ecosystem

    Glossary, sister systems, and the integration seam for this room.

    AI omni-channel agents A voice bot still needs a session. SIP creates, modifies, and ends sessions. Omni-channel, in the contact-center sense, means the same contact can also live on chat or another digital channel. Those channels do not replace the voice session. On Amazon Connect the platform owns the managed PSTN voice channel. Bridging an outside carrier into Connect with a Chime Voice Connector is not a supported pattern unless AWS reviews it. When an SBC forks the voice leg to a recorder, that fork is SIPREC, a different plane from the customer dialog.

    AI agents A voice bot still needs a session. On Amazon Connect the platform owns the managed PSTN voice channel. Bridging an outside carrier into Connect with a Chime Voice Connector is not a supported pattern unless AWS reviews it. The FreeSWITCH manual page also describes SignalWire, founded by the FreeSWITCH team, as a hosted platform with AI agents behind REST APIs and SWML.

    Glossary · Ecosystem map · Ports · Troubleshooting

    Sources and go deeper