Some users report that using a domain name (an FQDN) in the “ip” field fails to validate the SIP gateway / credential. On OVH, Confirm that sbc6.fr.sip.ovh is a stable domain, Start with that, then test outbound calls; if they fail, try the resolved IP to rule out DNS issues. For inbound, make sure OVH is routing correctly and that you’ve whitelisted Vapi’s signaling IPs (44.229.228.186 and 44.238.177.138). use the FQDN first, verify both directions, fall back to IPs if needed, and plan for redundancy.