| 1st choice | 2nd choice |
| username=xxxx type=peer secret=… qualify=yes nat=yes insecure=port,invite host={example}.pstn.us1.twilio.com disallow=all allow=ulaw | username=xxxx type=peer secret=…. qualify=yes nat=yes insecure=port,invite host={example}.pstn.us2.twilio.com disallow=all allow=ulaw |
| incoming 1st | 2nd | incoming 3rd | 4th |
| disallow=all type=peer qualify=yes host=54.172.60.0 context=from-trunk canreinvite=no allow=ulaw | disallow=all type=peer qualify=yes host=54.172.60.2 context=from-trunk canreinvite=no allow=ulaw |