How many simultaneous calls can OPAL/OpenH323 handle?
The short answer is that it depends on your application, and the amount of CPU you have. A more precise answer is that without any modification, a standard OPAL/OpenH323 application on Linux that handles both signaling and media will hit the per-process file handle limit at about 80 simultaneous calls. By increasing the per-process file handle limit to 16384 (using “ulimit”) the maximum call density is around 1300 calls. If the calls always use H.245 tunneling, this will increase to 110 and 1800. If the calls are signaling only, the limits are 330 and 5400. The limits on Windows are around 1000 calls regardless of the call type. An OpenH323 application can increase these limits further by enabling signaling aggregation. This feature is not yet available on OPAL.
