If you are using MyOperator and have a firewall setup to filter traffic, then you will have to allow the following new IPs to be whitelisted.
API Integration: (Last updated on June 25, 2016)
To be announced
Here's how to go about it:
Configure your firewall
HTTP/HTTPS transports: allow traffic from these source IP ranges to access your HTTP (TCP port 80) and/or HTTPS (TCP port 443) web applications
SIP transport: allow traffic from these source IP ranges and source ports UDP 5060, TCP 5060, UDP 5080, TCP 5080, UDP 5061, TCP 5061, UDP 5063, TCP 5063
- RTP transport: allow traffic from these source IP ranges to UDP port range 16384 to 32768