Hi there! đź‘‹
We’re using SIP Trunking with Vapi and have been experiencing intermittent one-way audio or silent calls.
According to the documentation, only two IPs need to be whitelisted for SIP signaling:
44.229.228.186/32
44.238.177.138/32
However, while monitoring production traffic, we’re seeing RTP traffic coming from several additional IPs.
After adding these IPs to our firewall, call audio improved (fewer silent cases), but new IPs keep appearing over time.
So far, we’ve added this full list:
35.89.67.171
44.247.54.98
44.249.102.120
44.251.170.45
44.238.177.138
44.229.228.186
35.185.187.110
35.247.157.189
35.204.38.71
34.147.113.54
35.92.126.90
35.165.205.132
34.59.11.47
Question:
Could you please confirm the complete and up-to-date list of IPs (both for signaling and RTP/media) that should be whitelisted to prevent call drops or silent audio?
Also, is there a recommended general range of ports or IPs that covers all possible RTP endpoints used by Vapi or its underlying carriers?
Thanks in advance 🙏