H.323 specifies how real time services may be implemented over IP networks. The 3 steps include H.225 signalling for agents to request access to the H.323 domain. H.245 signalling is then employed for call setup, including the media streams to be used. Finally data is transported using RTP (Real Time Protocol).


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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