Please whitelist all the IP’s below and refer to the Zentrunk SIP Trunking interconnection guides for more details on how to configure your infrastructure.

SIP IPs

52.8.204.190 
52.8.220.135 
52.9.121.155
52.8.45.238

RTP IPs (Media Server)

98.158.106.139
87.239.190.76
103.6.128.197
98.158.107.35
98.158.100.5
177.71.156.31
54.206.207.200
98.158.106.140
87.239.190.77
103.6.128.198
98.158.107.18
98.158.100.30
54.207.147.137
54.206.130.0