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Pre NNP

This document provides a detailed overview of the Telephone Number Routing System, covering how calls are originated, routed, and terminated based on various criteria such as caller's number, dialed number, and portability. It explains the role of different switching networks and databases in the call routing process. Additionally, it discusses the classification and routing of calls based on number types, including portable and non-portable numbers. The document also outlines the interaction between different classes of switches and databases in routing intra-switch and inter-switch calls.

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Pre NNP

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  1. Pre NNP

  2. A call is originated Pre NNP IXC Queries Database for LRN Originating Switching Network Determines Calling Number’s presubscribed IXC Slides 14-22 Is the Dialed Number Local No Originating Switching Network Queries Database for LRN Slides 17-22 Based upon query Response (CdPN/LRN,) Call is routed to Inter Switch trunk toward terminating network Yes IXC Switch determines if Dialed NPA NXX is portable Yes Local Switch determines if Dialed NPA NXX is portable Slides 7-13 Yes Based upon query Response (CdPN/LRN,) Call is routed to Inter Switch trunk toward terminating network No Slides 3-6 No Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Slides 14-16 Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line

  3. Pre NNPPSTN Class 5 – Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E

  4. Pre NNP PSTN Class 5 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D E F ISUP Trunk

  5. Pre NNP PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch ISUP Trunk

  6. Pre NNP PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch Class 4 Switch ISUP Trunk

  7. Pre NNP PSTN Class 5 – Portable NXX Non-Ported Number Intra Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G LNP Query CdPN

  8. Pre NNP PSTN Class 5 to Class 5 – Portable NXX Non-Ported NumberIntrer Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H LNP Query CdPN ISUP Trunk

  9. Pre NNP PSTN Class 5 to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H Class 4 Switch LNP Query CdPN ISUP Trunk

  10. Pre NNP PSTN Class 5 to Class 4 to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H Class 4 Switch Class 4 Switch LNP Query CdPN ISUP Trunk

  11. Pre NNP PSTN Class 5 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H LNP Query LRN ISUP Trunk CdPN = LRN, GAP = DN, M-bit = 1

  12. Pre NNP PSTN Class 5 to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H Class 4 Switch LNP Query LRN ISUP Trunk

  13. Pre NNP PSTN Class 5 to Class 4 to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database Class 5 Switch A B C D E F G H Class 4 Switch Class 4 Switch LNP Query LRN ISUP Trunk

  14. Pre NNP PSTN Class 5 to IXC to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H LNP Query CdPN ISUP Trunk

  15. Pre NNP PSTN Class 5 to Class 4 to IXC to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H Class 4 Switch LNP Query CdPN ISUP Trunk

  16. Pre NNP PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A G H B D E F C Class 4 Switch Class 4 Switch LNP Query CdPN ISUP Trunk

  17. Pre NNP PSTN Class 5 to IXC to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H LNP Query LRN ISUP Trunk

  18. Pre NNP PSTN Class 5 to Class 4 to IXC to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H Class 4 Switch LNP Query LRN ISUP Trunk

  19. Pre NNP PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A G H B D E F C Class 4 Switch Class 4 Switch LNP Query LRN ISUP Trunk

  20. NLRN Option 1

  21. A call is originated Based on LRN, Call is routed to Inter Switch trunk toward terminating network NNP NLRNOption 1Query by IXC Switch Determines Calling Number’s presubscribed IXC Slides 31-44 Switch determines if Dialed NPA NXX is portable Is the Dialed Number Local Yes Slides 39-44 Yes Is the Dialed Number Local IXC Queries Database for LRN Yes Yes Call is rejected by Calling Number’s IXC No No Call is rejected by Calling Number’s IXC Slides 32-38 No Slides 42-44 Slides 25-31 Slides 38-41 Slides 36-38 Is the Dialed Number Ported No Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Slides 32-35

  22. NNP NLRNOption 1Query by IXCPSTN Class 5 – Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E

  23. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D E F ISUP Trunk

  24. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch ISUP Trunk

  25. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch Class 4 Switch ISUP Trunk

  26. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F ISUP Trunk

  27. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F Class 4 Switch ISUP Trunk

  28. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F Class 4 Switch Class 4 Switch ISUP Trunk

  29. NNP NLRN Option 1 Query by IXC PSTN Class 5 – Portable NXX Non-Ported Number Intra Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H LNP Query CdPN

  30. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 – Portable NXX Non-Ported NumberIntrer Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H LNP Query CdPN ISUP Trunk

  31. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H Class 4 Switch LNP Query CdPN ISUP Trunk

  32. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch H C A B E F G D Class 4 Switch Class 4 Switch LNP Query CdPN ISUP Trunk

  33. NNP NLRN Option 1 Query by IXC PSTN Class 5 to IXC to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G LNP Query CdPN ISUP Trunk

  34. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber . LNP Database IXC Class 5 Switch A B C D E F G Class 4 Switch LNP Query CdPN ISUP Trunk

  35. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Portable NXX Non-Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G Class 4 Switch Class 4 Switch LNP Query CdPN ISUP Trunk

  36. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H LNP Query LRN ISUP Trunk

  37. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G H Class 4 Switch LNP Query LRN ISUP Trunk

  38. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Local Call Routed to Subscriber LNP Database IXC Class 5 Switch H C A B E F G D Class 4 Switch Class 4 Switch LNP Query LRN ISUP Trunk

  39. NNP NLRN Option 1 Query by IXC PSTN Class 5 to IXC to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G LNP Query LRN ISUP Trunk

  40. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G Class 4 Switch LNP Query LRN ISUP Trunk

  41. NNP NLRN Option 1 Query by IXC PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Portable NXX Ported Number Inter Switch Long Distance Call Routed to Subscriber LNP Database IXC Class 5 Switch A B C D E F G Class 4 Switch Class 4 Switch LNP Query LRN ISUP Trunk

  42. NLRN Option 2

  43. A call is originated NNP NLRNOption 2Portable = LD Switch Determines Calling Number’s presubscribed IXC Slides 54-66 Switch determines if Dialed NPA NXX is portable Yes IXC Queries Database for LRN Based on CDPN, Call is routed to Inter Switch trunk toward terminating network Based on LRN, Call is routed to Inter Switch trunk toward terminating network No Slides 54-60 Slides 61-66 Slides 47-53 Is the Dialed Number Ported No Yes Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line Call is routed to the appropriate terminating end office or network for termination to subscriber’s Line

  44. NNP NLRNOption 2Portable = LD2PSTN Class 5 – Non-portable NXX Intra Switch Local Call Routed to Subscriber Class 5 Switch A B C D E

  45. NNP NLRNOption 2Portable = LDPortable = LDPSTN Class 5 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed to Subscriber Class 5 Switch A B C D E F ISUP Trunk

  46. NNP NLRNOption 2Portable = LD PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch ISUP Trunk

  47. NNP NLRNOption 2Portable = LD PSTN Class 5 to Class 4 to Class 5 – Non-Portable NXX Inter Switch Local Call Routed Direct to Subscriber Class 5 Switch A B C D E F Class 4 Switch Class 4 Switch ISUP Trunk

  48. NNP NLRNOption 2Portable = LD PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F ISUP Trunk

  49. NNP NLRNOption 2Portable = LD PSTN Class 5 to Class 4 to IXC to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F Class 4 Switch ISUP Trunk

  50. NNP NLRNOption 2Portable = LD PSTN Class 5 to Class 4 to IXC to Class 4 to Class 5 – Non-Portable NXX Inter Switch Long Distance Call Routed to Subscriber IXC Class 5 Switch A B C D E F Class 4 Switch Class 4 Switch ISUP Trunk

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