In order for incoming or outgoing message callbacks to work in your Developers Central account, you’ll need to whitelist the new source IPs for all callbacks.
The new IP addresses will come into effect as soon as the cutover is complete. This is scheduled for 22 April from 07:00 – 09:00 (GMT+2). You can, however, already whitelist the new IP addresses in order to minimize service disruption.
The new IP addresses for callbacks will be:
22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11
If you need any assistance, please contact our support team who are ready to assist with any queries you may have.