DSC TL250 Protocol to Central Station Receiver ?

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Does anyone know what protocol use the TL-250 for communication to the
Central Station Receiver (for example DRL3-IP ) ?
I try to make IP communication modul accourding to SIA-DCS Internet
Protocol Event Reporting, but currently I have big problems to test
it. I have found DSC free receiver station for tests at :
https://www.dsc.com/iptesting/
but when I sent some packets according to ANSI/SIA DC-09-200x the
receiver makes no reply. Have someone sample packet from communication
TL250 - Central Station Receiver ?

Thanks in advance,
Ilian