Sangoma netborder ss7 megaco no RTP issue

Dear All,

i have a media gateway controller which supports megaco and sigtran. i want to use sangoma cards to build an ss7 network. for this purpose i have created a lab. i have a 1E1 sangoma card A101. i have installed the nsg-5.2.0-126-Dynamic-Config-unattended.iso and run it properly. signalling works and megaco also works. but when i make a call, i faced with no RTP issue. call is established with MEGACO protocol. but sangoma doesnt create RTP packets to send to remote side. is there any one that can help me to solve this problem?