16.6. Display of System Shortages 
The OpenScape Business uses Digital Signal Processor (DSP) for transcoding the payload from ISDN/ TDM to IP and vice versa. The available DSP resources are managed dynamically by OpenScape Business. The amount of required DSP channels depends on the connected trunks and devices on one hand and on the call traffic on the other hand.
DSP Channel Resources
In case the OpenScape contact center cannot transfer a call to an agent due to missing
DSP resource for three times, the following alarm message will be displayed in a pop
up window at the agent´s desktop:
A call cannot be handled at this time due to limited system resources. Please contact your technical support.If this message appears, the agent is temporarily disqualified for that particular call. Other calls will be sent to the agent as normal. The call which could not be delivered is sent to other available agents within the queue. If the call is sent to all agents without success, it is sent to the first agent again. The pop up window is automatically closed at the agent´s desktop, as soon as the call is successfully delivered to another agent. The DSP channel shortage can be remedied either by plugging an additional DSP module to OpenScape Business mainboard (X models only), or by avoiding TDM/ IP transcoding. This can be realized by replacing the agents’ TDM phones with IP phones.