IAX2 IP and Port Information
DIDWW originates calls to customers from the following endpoints:
18.104.22.168:4569 (for US POP)
22.214.171.124:4569 (for EU POP)
RTP traffic might arrive from following subnet:
with RTP port-range: 1024-65535
For IAX2 port, UDP 4569 is used by default, non-default port can be specified in “Trunks” configuration.