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This paper introduces a hierarchical route management simulation model in OPNET modeler to allow performance evaluation of different scenarios proposed for interconnections between different administrative levels of control segments -provincial and national- of next generation network (NGN) in call routing procedure. The provided model is an enhancement over the original SIP model existing in the standard model library of OPNET modeler to allow simulation based on the hierarchical rouling, featuring a full implementation of provincial and national call servers task definition in routing various types of calls generated throughout the entire network. This model encompasses multi-domain routing capability that is not considered in existing SIP model. Additionally, this model is capable of implementing various numbering procedures legislated in the network. One of its key aspects is introduction to the concept of location server, which can be used as a feature to define various routing plans in different scenarios.