Margin protection — NEXIA Switch Wiki

Margin protection makes a carrier carry the call only if it leaves you the minimum profit you set. It is the difference between routing cheap and routing profitably: LCR picks the cheapest carrier, but nothing stops it from picking one that still loses you money on that particular destination.

Where it is

Routing → Dial Peers → CONFIGURE on the peer, section 2. How the call goes out, Protect the margin block.

How it works

For every number, NEXIA compares two prices it already holds:

Price	Where it comes from
Selling	The tariff you pick in Selling tariff to protect — what you charge the client for that number.
Cost	The provider tariff assigned to the Termination Point — what that carrier charges you for that number.

The difference is the margin: selling − cost. A carrier that does not clear the floor is not used for that number, and the call moves on to the next one. If none clears it, the dial peer does not take the call and it falls through to the next peer in the routing group.

The two floors

Min. margin / min: minimum profit per minute, in the tariff's currency. For example 0.002 requires keeping at least two thousandths per minute.
or min. margin %: minimum profit as a percentage of the selling rate. For example 15 requires keeping 15% of what you charge.

Set both and a carrier has to clear both.

The floor can be negative. A value like -0.001 means “I accept losing up to one thousandth per minute”, useful when you want to keep a destination alive at a controlled loss. 0 is the classic “never lose money”. Leaving the tariff empty turns the check off entirely.

Example

You sell Colombia mobile at 0.0220 and have two carriers, one at 0.0100 and one at 0.0215. With a 0.005 floor:

Carrier A leaves 0.0120 → clears the floor, it is used.
Carrier B leaves 0.0005 → short of it, left out for that destination.

Carrier B stays available wherever it is profitable: the check runs per number, not per carrier.

Check it before your traffic does

Further down the same peer sits the Simulator. Type a real number and it shows the selling rate applied, the configured floor, the margin each carrier leaves, and which ones were rejected and why.

How precise the check is

Margin is evaluated with the price of the most specific prefix your tariffs carry. If your rule covers a whole country (say 51) while the tariffs price 519, protection applies there — where the money actually changes.

For the check to have something to compare, every Termination Point needs its provider tariff assigned (Users → Termination Points), and the destination has to exist in the selling tariff. If either side has no price for that number, NEXIA does not invent a margin: it lets the call through and tells you so in the simulator.