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Direct Routing SIP signaling FQDNs
Hi,
https://docs.microsoft.com/en-us/microsoftteams/direct-routing-plan#sip-signaling-fqdns
The above document has been updated recently and it states
The FQDNs – sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com and sip3.pstnhub.microsoft.com – will be resolved to IP addresses from the following subnets:
- 52.112.0.0/14
- 52.120.0.0/14
But when you do a nslookup for sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com and sip3.pstnhub.microsoft.com, none of them resolve to any of the above subnets. I distinctly remember previously the list of IP address used to be
52.114.7.24, 52.114.132.46, 52.114.75.24, 52.114.76.76, 52.114.148.0, 52.114.14.70,
52.114.16.74, 52.114.20.29, 52.112.0.0/14
Can someone from Microsoft clarify this. I don't see 52.114.x.x subnet in the documentation.
Thanks,
-Balaji
- You may want to check a subnet calculator
52.112.0.0/14 contains 52.112.0.0 - 52.115.255.255
It includes the 52.114.x.x range.
- You may want to check a subnet calculator
52.112.0.0/14 contains 52.112.0.0 - 52.115.255.255
It includes the 52.114.x.x range.You are right, I didn't realize /14 covers 52.114.x.x. Thanks for pointing it out.
See here
Azure direct routing infrastructure requirements - Azure Communication Services | Microsoft Docs
The FQDNs – sip.pstnhub.microsoft.com, sip2.pstnhub.microsoft.com, and sip3.pstnhub.microsoft.com – will be resolved to one of the following IP addresses:
52.114.148.052.114.132.4652.114.75.2452.114.76.7652.114.7.2452.114.14.7052.114.16.7452.114.20.29
Hope that answers your question 😄
Best, Chris
- Thanks ChrisHoardMVP for your quick reply. Yes, these are the IPs I had originally. Even though both document got updated on 06/30/2021, the IP address list seems to be incorrect on the one that I referred.
