It really comes down to whether IPT requires IP whitelisting, if they do and Vapi doesn’t offer a static outbound IP, you’ll likely need an SBC in between. Vapi works fine with most standard SIP trunks, but it depends on how IPT handles auth and media. If they’re strict, something like Jambonz can give you more control and stability. Do you know if they use IP auth or just SIP credentials? @hasbik