• Is there credit in Flowroute?

• Is Allow Anonymous Inbound SIP Calls enabled in SIP Settings?

• Is Allow SIP Guests enabled in SIP Settings?

• Are the 4 PoPs IPs allowed through firewall?

• Have you checked the ban list?

• Have you power cycled the PBX

• Do you have the current SIP Trunk settings (no "remove-plus"?)

• Make sure default edge strategy in Flowroute is VA

Things it's NOT:

• UDP for incoming port

• IP address for Outgoing PEER (instead of DNS name)

• Ma