Twilio: cannot rename subdomain null for SIP termination
问题 In relation to SIP registration, simply trying to add termination URI: Termination URI Configure a SIP Domain Name to uniquely identify your Termination SIP URI for this Trunk. This URI will be used by your communications infrastructure to direct SIP traffic towards Twilio. When you point your infrastructure toward this URI, Twilio uses a Geo DNS lookup to intelligently direct your traffic to our closest POP. Learn more about Termination Settings I can add <foo>.pstn.twilio.com fine, but get