List of IP addresses used for origination

If you are restricting inbound traffic by IP via a firewall or ACL, you will need to whitelist the following IP addresses in order to receive inbound calls:

US1: 67.205.139.35 , 67.205.139.36 (New York, NY, United States)
US2: 209.124.34.0/24 (Southfield, MI, United States)
US3: 206.189.208.231, 206.189.208.232 (San Francisco, CA, United States)
CA1: 138.197.130.40, 138.197.130.41, 138.197.130.42, 138.197.130.43 (Toronto, Canada)
UK1: 41.218.96.0/24 (Rugby, England)
UK2: 139.59.178.18, 139.59.178.19, 139.59.178.20 (London, United Kingdom)
DE1: 139.59.156.181, 139.59.156.182, 139.59.156.183 (Frankfurt, Germany)
NL1 95.85.22.190, 95.85.22.191 (Amsterdam, Netherlands)
SG1: 128.199.64.52 (Singapore, Singapore)
AU1: 45.32.247.20 (Sydney, Australia)
FR1: 104.238.189.1, 104.238.189.100 (Paris, France)
ZA1: 154.127.61.44 (Johannesburg, South Africa)
BR1: 35.199.100.51 ( Sao Paolo, Brazil)

Please note that you should not necessarily allow all these IP addresses. It is ideal if you can do it, but if not, then you should allow at least US (which is the Default zone) along with whichever other geographic zone(or zones) you're closest to.