DAG1000/2000 Series FXS Voice Gateway User Manual28Send CID before Ringing After enable this configuration, The DAG send caller to phone set beforeringing, otherwise the caller ID will display after ringing.Delay of sending CID afterRingingDefinite delay timer of caller ID while it set to send caller ID after ringing.Its Default value 500msSLIC Setting Set the unit impedance4.8.2 Media ParameterMedia parameter mainly include: RTP start port, DTMF parameter, Prefered Vocoder.Configuration Interface as follow:Figure 4.8-2 Media Parameter Configuration InterfaceMedia parameter description:RTP Start Port Default RTP port 8000DTMF Method SINGAL、INBAND、RFC2833RFC2833 Payload Type OptimizationIt is configurable When RFC2833 is selected,payload negotiation parameter with remote side, itincludes two options: Local and remoteRFC2833 Payload Type Payload value, default is 101DTMF Gain Default is 0 DBDTMF Send Interval DTMF send signal interval, default is 200ms.Coder NameDAG supports G729、G711U、G711A、G723. whileit make outgoing call, G.729 will used as figure4.8.2 displayed