Now We have NGN (Next Generation Network ) Architecture. But before NGN we had Legacy architecture. Following Figure will give an idea about Legacy architecture with all the features/services included.
Note: SCCP Roaming link will carry only signaling. And through an IDD Carrier we transfer both signaling and voice.
Now this legacy system was replaced by a NGN (MSCs by WCS and MGW).I will talk about it in my next posts......
