When calling my Twillio number the following message is logged on my teleworker server. The call fails and twilio shows "480 Temporarily Unavailable" What the odd part is that this worked at one point then just stopped.
2017-10-11 09:30:43.104 {139696703723264} [UA] Call-ID: 0bdef459598c0216f3450f275c75ce03@0.0.0.0
2017-10-11 09:30:43.104 {139696703723264} [UA] CSeq: 1 INVITE
2017-10-11 09:30:43.104 {139696703723264} [UA] Date: Wed, 11 Oct 2017 13:30:43 GMT
2017-10-11 09:30:43.104 {139696703723264} [UA] User-Agent: Mitel Border GW/4.8.0.19-01
2017-10-11 09:30:43.104 {139696703723264} [UA] Warning: 399 10.1.2.5 "09H Subscriber Out of Service"
2017-10-11 09:30:43.104 {139696703723264} [UA] Content-Length: 0
