> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/parameter-reference/lnp-options-incoming-calls-lnp-mode.md).

# LNP Options: Incoming Calls LNP Mode

Terminate LNP

* Routing is done using the real called party number (not the LRN). LNP fields are ignored for the outgoing leg. (Default)

Forward LNP from incoming to outgoing call

* Routing is done using the LRN when available otherwise the called party number is used. LNP fields are kept for possible relay on outgoing leg.

Ignore LNP information

* Routing is done using the called party number. LNP fields are ignored for the outgoing leg.

The following table contains the pseudo-code of the mapping according to the configuration AND the content of the incoming call signaling:

**CPN** = called party number or the TO sip header

**called** = called number variable accessible in routing script

**GAP** = generic address number SS7 information element type 0xc0

**ported\_number** = extra number type accessible in the routing script

**RN** = rn field in SIP request URI

**bitM** = SS7 Forward call indicator information element: ported number translation indicator (bit M)

**X** = drop number

| Incoming NAP conf. | Incoming SS7                                                                                             | Incoming SIP                                                                                                          |
| ------------------ | -------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
| Ignore             | CPN => called GAP => X                                                                                   | CPN => called RN => X                                                                                                 |
| Terminate          | GAP => called CPN => X ported\_number not available                                                      | CPN => called RN => X ported\_number not available                                                                    |
| Forward            | if bitM=1 then : "" => ported\_number : if GAP then :: CPN => called :: GAP => PNB :else ::CPN => called | \| if npdi=yes then : "" => ported\_number : if RN then :: CPN => ported\_number :: RN=> called :else ::CPN => called |


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