When multiple IBM
® Sametime servers are installed in an IBM Lotus
® environment, the Sametime
® servers must be able to communicate on specific ports.
Ports required for communication between Sametime servers
Ports for Meetings do not apply to Sametime
Limited Use, or versions of Sametime
that do not support web conferencing.
The table below lists the ports on which Sametime
servers communicate with each other. When these ports are open, Community Services and Meeting Services data can pass between the two servers, and one Sametime
server can invite the other to a meeting.
| Port || Description |
| Port 1503 ||Port 1503 is the default "Meeting Server port for server connections." This port is configurable from the Configuration - Connectivity - Network and Port Settings - Meeting Services Network options in the Sametime Administration Tool. The "Meeting Server port for server connections" setting must be set to the same port number for the Sametime servers. |
The servers must communicate on TCP/IP port 1503 to exchange Meeting Services data.
| Port 1516 ||The Community Services listen for direct TCP/IP connections from the Community Services of other Sametime servers on this port. If you have installed multiple Sametime servers, this port must be open for presence, chat, and other Community Services data to pass between the servers. |
The communications that occur on this port also enable one Sametime server to start a meeting on another server (or "invite" the other server to the meeting).
| Port 1352 ||The servers must be able to communicate on port 1352 for replication to occur between the Sametime servers. This is the port used for Notes® and Domino Remote Procedure Calls (RPCs). |
About invited servers, audio/video, and client connectivity
When one Sametime
server invites another Sametime
server to a meeting that includes interactive audio/video, the audio/video data is not transmitted between the two Sametime
servers. Instead, the user must connect to the Sametime
server on which a meeting was started and receive the audio/video streams directly from that host server. For example, assume a meeting that includes chat, screen sharing, and audio/video is started on Sametime
server A and Sametime
server A invites Sametime
server B to the meeting. A user can attend the meeting on Sametime
server B (the invited server) and receive the chat and screen sharing data from Sametime
server B. However, the user is redirected to Sametime
server A for the audio/video data.
Next, perform the procedures described in Synchronize the Sametime server with other Sametime servers
deployed in the environment.
Parent topic: Integrating a Sametime server into an existing Sametime community
Integrating a Sametime server into an existing Sametime community
Ports used by the Sametime Community Server