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IP network provides TCAP message transport between two SS7 networks: [Page 6] The TCAP message is originated from one SS7 network and is terminated to a far-end SS7 network.
The TCAP query message launched by the terminating switch may be transported via the IP network to the originating network to retrieve the calling name information.
Upon receiving the TCAP message, TIPG-2 records the mapping between the originating PC and IP address of the far end TIPG-1, decapsulates the IP header, encapsulates the TCAP message with the SS7 header, and delivers to the interconnecting SS7 network.