Voice IP addresses to whitelist:

The following IP addresses and domains are prioritized by importance. Begin by ensuring the required ones are whitelisted, as they are essential for functionality. Once those are addressed, proceed through the rest of the list in order, resolving any connectivity issues step by step.

SIP Signaling (Required):

52.9.254.123/32:5060 (TCP/UDP)

SIP Domains (Required):

(Plivo API)
api.plivo.com
https://api.plivo.com
http://api.plivo.com

Symbo Dialer (Recommended):

https://*.symbo.com
httpsL//*.symbo.lol

RTP Media Servers (Recommended):

If you are still facing issues, you can try whitelisting the following IP addresses to ensure that you can make and receive calls from all locations.

Name	IP Addresses	Ports
SIP Signaling	52.9.254.123/32 52.9.254.127/32 216.120.187.64/32 216.120.187.65/32 216.120.187.66/32 216.120.187.67/32 216.120.187.68/32 204.89.148.64/32 204.89.148.65/32 204.89.148.66/32 204.89.148.67/32 204.89.148.68/32	5060, 5080 (UDP) 5060, 5061, 5063, 5080, 443 (TCP)
San Jose, California, USA	216.120.187.64/25 216.120.187.192/27	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
Ashburn, Virginia, USA	204.89.148.64/25 204.89.148.192/27	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
Frankfurt, Germany	3.120.121.128/26	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
São Paulo, Brazil	54.233.191.0/27 18.228.70.64/26	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
Sydney, Australia	13.238.202.192/26	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
Singapore	52.220.63.176/28 204.89.149.64/27 204.89.149.128/27	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)
Mumbai, India	204.89.151.64/26 204.89.151.128/25	16384 - 32768 (UDP) 10000 - 30000 (UDP/TCP)

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