LCR

LCR

Route Cost

• first unit len: First fraction in seconds.
• first unit cost: Cost per minute used to tariff if the call lasts less or equal to first unit len.
• next unit len: After first unit len seconds, the call will be fractioned in this amount of seconds.
• next unit cost: Cost per minute, to charge per every next unit len seconds.

Intra costs

Additionally, for intra-state calls, each route has:

• intra_first unit len
• intra_first unit cost
• intra_next unit len
• intra_next unit cost

These are optional, and can be null. If they are not null, and both the destination and caller are in the US (i.e: their e164 number starts with 1), the db table intra_state_codes will be looked up for, trying to match the first 4 digits of the numbers to a state name, and comparing them. If the call begins and ends in the same state, the call is considered an intra state call, and the intra_* family of costs are used to calculate LCR and route costs.

Cost example

Given:

• first unit len = 15
• first unit cost = 0.015
• next unit len = 15
• next unit cost = 0.017

For a call of 45 seconds, the first 15 seconds are charge with a rate of 0.015/min, the rest of the call is fractioned in 15 seconds also, but at 0.017/min. The resulting cost is

   1 unit of 15s at 0.015/min = 0.00375
+  2 units of 15s at 0.017/min = 0.00425 * 2 = 0.0085
   ---------------------------------------------------
   Total cost: 0.01225

LCR Calculation

An average call length (See Configuration Options) is used to calculate the cost (using the variables above), and this is the LCR cost used to sort the routes.