Microsoft will discontinue support for sip-all.pstnhub.microsoft.com on March 1.
The DNS entry sip-all.pstnhub.microsoft.com currently still returns all IP addresses of the data centers used by Teams Direct Routing.
Instead of sip-all.pstnhub.microsoft.com, two network ranges should now be used:
- 52.112.0.0/14
- 52.120.0.0/14
The sip-all.pstnhub.microsoft.com is used by anynode in all “Network Peer Whitelists” of the “SIP Transport” object to allow communication only with the returned datacenters.
The new anynode version 4.6 will update the Network Peer Whitelists automatically.
Those who do not want to wait for this update can make the changes themselves. To do this, the “Network Peer Whitelist” in the SIP Transport Object of each Teams Node must be supplemented by the two network areas. Afterward, you can remove sip-all.pstnhub.microsoft.com and the IP addresses of the data centers if they are still entered. Local IP addresses that are needed to use a Teams SBA must remain on the list.
Please do not forget to check if external firewalls are still configured to single Microsoft IP addresses. These must also be changed to 52.112.0.0/14 and 52.120.0.0/14.
