Auslastungs meldung aber CPU Last 2%?

[baeckerman83]

Hi!
Ich bekomme folgenden Meldungen:

[Aug 19 18:18:00] WARNING[19514]: pbx.c:3912 increase_call_count: Maximum loadavg limit of 0.900000 load exceeded by 'SIP/sipgate.de-099f3f88' (currently 2.340000)!
[Aug 19 18:18:00] WARNING[19514]: chan_sip.c:17496 handle_request_invite: Failed to start PBX (call limit reached)
  == Using SIP RTP CoS mark 5
[Aug 19 18:18:24] WARNING[19514]: pbx.c:3912 increase_call_count: Maximum loadavg limit of 0.900000 load exceeded by 'SIP/sipgate.de-099f3f88' (currently 1.680000)!
[Aug 19 18:18:24] WARNING[19514]: chan_sip.c:17496 handle_request_invite: Failed to start PBX (call limit reached)
  == Using SIP RTP CoS mark 5
[Aug 19 18:18:26] WARNING[19514]: pbx.c:3912 increase_call_count: Maximum loadavg limit of 0.900000 load exceeded by 'SIP/80.237.199.41-099f3f88' (currently 1.540000)!
[Aug 19 18:18:26] WARNING[19514]: chan_sip.c:17496 handle_request_invite: Failed to start PBX (call limit reached)

ABer wenn ich nebenbei Top auf mache ist die CPU Last sehr niedrig. Welche Last ist hiermit gemeint? Ist das Limit zu klein eingestellt? Wie bekomme ich mehr Calls durch?