Sometimes you might want/need to use NAPTR DNS records as part of your SIP setup. A while ago it was quite difficult to find DNS providers that support them and don’t charge you an arm and a leg for it, but the situation has improved quite a bit. Below are some DNS service providers that claimed to support NAPTR records:
- dnsimple
- Fastmail
- Google Cloud DNS
- AWS Route 53
- Some smaller providers may support them but not advertise this.