alright - thx for the Link!
Thought one should priorize RTP Traffic higher than SIP Traffic and not simply raise all Traffic from 3CX Server to DSCP 56 ... mhhh
- http://kb.smartvox.co.uk/ip-phones/sip-configuration/voip-qos-settings-part-1/
- http://kb.smartvox.co.uk/ip-phones/sip-configuration/voip-qos-settings-part-2/
Andreas