How many simultanious call at time?

How many simultanious [SIP/ZAP] will support a CPU with
256 of RAM
512 MHZ?

[quote=“gnu”]How many simultanious [SIP/ZAP] will support a CPU with
256 of RAM
512 MHZ?[/quote]
On a FON2100 (16MB RAM, 1883MHz) running an self-built and stripped-down OpenWRT firmware, it had no problem to serve me with three concurrent calls with no transcoding and the CPU usage fluctuated around 60%, IIRC. Unfortunately, I didn’t have enough callers/callees to test beyond three concurrent calls at the time.