LNP/MNP information¶

• Table of contents
• LNP/MNP information
  • LNP/MNP information inside a call.

LNP/MNP (Local number portability/Mobile number portability) - see Number portability.

LNP/MNP information service - informational service, which is provided by a number of suppliers.
To use this service, customer sends a query to a supplier of LNP/MNP information.
Query contains E.164 subscriber's number of interest.
In response, LNP/MNP supplier sends information data for this number, such as:

• LRN (Location routing number) of a subscriber.
  If NPDI = yes, then this number should be used for call Routing and Billing instead of E.164 subscriber's number that is present in signaling.
  If LRN is empty, then it means, that E.164 subscriber's number should be used for call Routing and Billing.
• NPDI (Network protocol dip indicator) - indicates whether LNP/MNP database has been successfully queried.
  Can be: yes - LNP/MNP database has been successfully queried and LRN contains valid number, no - LNP/MNP database query hasn't been performed and LRN doesn't contain valid number
• etc

The contains of LNP/MNP response can vary depending on:

• supplier
• tariff plan chosen by customer.
  For example, more information in LNP/MNP response could cost additional money at the same provider.

To generate response, LNP/MNP information provider could appeal to:

• directly to mobile operators
• to centralized database of LNP/MNP information
• to his local database, in which results of previous queries are cached
• to his local database, which has been replicated from database of other LNP/MNP information suppliers
• to other LNP/MNP information suppliers

As far as LNP/MNP information constantly changes due to Number portability, the source of data greatly influences the freshness of information and the response latency.
Also price may depend on a source of information which is used by LNP/MNP information provider.
Obviously, direct query to mobile operators will cost more that lookup in local database.

Smartswitch can act both as supplicant and supplier of LNP/MNP information, see section LNP/MNP query.

After getting response for LNP/MNP query from LNP/MNP provider, Smartswitch stores it into LNP/MNP cache.

LNP/MNP information inside a call.¶

LNP/MNP information could be present inside a call from originator.
For example, you can get a cal with B-number of 380973301330;rn=380504440444;npdi=yes.
This means, that your originator has already performed LNP/MNP query (because of npdi=yes) and got LRN 380504440444.
Depending on the level of your trust to a partner, you can trust this information and perform Billing on a number 380504440444 instead of 380973301330, or perform LNP/MNP query to your LNP/MNP information providers by yourself.
This behavior is controlled by an option trust LRN in originator's settings.
When trusting LNP/MNP information from your partner, you can save your funds, because you don't perform LNP/MNP queries by yourself.

Similarly, you can send LNP/MNP information to your partner to assure he will generate correct invoice to you and to save him from spending funds on LNP/MNP queries.
This behavior is controlled by option send LRN in terminator's settings.

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