Microsoft’s federated edge server is being upgraded to Lync Server 2010, which includes an IP address change.
Product version: Lync Server 2010
The federated edge server that supports Instant Messaging and conferencing with external companies will be migrated to Microsoft Lync Server 2010 on Friday, March 18, 2011.
After the server migration, the IP address for the microsoft.com SIP domain will change to 126.96.36.199. External companies who are federated with Microsoft may need to make changes to their infrastructure outlined in Instructions below in order for the federation to continue to function successfully.
Notify your contact with the external company that the IP address for the microsoft.com SIP domain is changing to 188.8.131.52 on Friday March 18, 2011. Depending on how their infrastructure is configured, they may need to make one of the following changes:
- Companies configured as direct federations using an IP address (not sipfed.microsoft.com) will need to update their configuration to the new IP address.
- Companies using a firewall to filter by IP address will need to update their Access Control List (ACL) to the new IP address.
Note: External companies that are configured as an Enhanced federation and who have configured their firewall to Allow All (inbound and outbound) on TCP:5061 according to Microsoft’s recommendations do not need to make any changes. They will experience a brief interruption in their ability to contact Microsoft employees through Lync or Communicator while the A record in DNS is automatically updated to reflect the new IP address.
To ensure connectivity with Microsoft while making this change, consider keeping the existing firewall rule and adding a new rule for the changed IP address. This approach reduces failed Instant Messaging and Presence updates during the actual transition and protects communications if implementation is delayed or the change must be rolled back.
Customers that originally configured their federation route with Microsoft to use an IP address will have to modify that entry and possibly their firewall rules to ensure communications continue successfully.
Article taken from NextHop