We’ve had several reports of inbound international (non-+1) calls failing to connect or even go to voicemail. Some of this has been chronicled in Bandwidth ticket #115171710, and they made some adjustments. However, the issue persisted and it seems there’s something wrong on our end.
Initially, the main error I was seeing in the logs was “No resources available; please retry” that seemed to be coming from Bandwidth. After Bandwidth made some changes, I was seeing “Gateway timeout” errors when trying to connect. Bandwidth said, “I can confirm in our logs that we are sending the SIP INVITEs to the SIP URI but receiving no responses back.”
Unfortunately, there’s been a lot of back and forth but not much determined.