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| TCAP | | ---        ---   | V52 |  | MTP3 |  | MTP3 |  | ISUP | | SCCP |  | DSS1 | | TCAP | ---        ---      |         |         |           |   |          |       |               ---  ---               ---  ---    |         |         |            |            |       |  |                           SCTP                           | | |                            IP                            |
 * V5UA | | M2UA |  | M2PA |      | M3UA |     | IUA |  | SUA |