Some applications allow the option to create a whitelist of IP addresses.
Below are the babelforce IP addresses you need to add:
SIP signaling gateway IPs:
RTP Media network IPs:
Note that traffic from API https endpoints can have different ranges over time and for different platform territories and deployments. It is better in most cases not to restrict to particular IPs. The API uses secured communication in any case and requires authentication with your systems to access them. The right way to use the APIs is to make sure that the authentication is done correctly.
If you have particular IP whitelisting requirements, then write to email@example.com