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Porta SIP

System Concepts

number for local calls. Customer-based translation rules allow you to

convert a number from a format specific to this particular customer.

There is a special dialing rules wizard available to make such configuration

easier, so that customers can even do this themselves. Customer-based

translation rules have two applications:

• When a number is submitted for authorization, these rules will be

applied, with the resulting number used to search rates. Thus, if

your customer dials 0042021234567, you can convert it to

42021234567 and find the correct rates for the 420 prefix.

• This number will be returned to the node which requested it.

Connection-based outgoing translation rules

If your vendor requires a special number format (e.g. tech-prefix), it is

possible to apply this rule to convert the number. When billing returns a

list of routes, the phone numbers for routes for this connection will be

converted. This only works for a routing model in which the VoIP node

(e.g. PortaSIP) requests billing for routing information. If your gateway

uses dial-peers or an external gatekeeper for routing, then you must

configure number translation there.

Connection-based translation rules

When the call has been terminated to the vendor in a vendor-specific

format, it will be reported to billing in this same format (e.g.

7834#42021234567). Now it is necessary to convert this number to the

proper format for billing (4202134567), which may be done using

connection translation rules. These rules will be applied to all calls which

go through a given connection (even those routed there using dial-peers

or other external tools)

Node-based translation rules

These serve the purpose of converting a number from a custom format

used by the customer into billing’s internal format during authorization,

depending on the gateway. For example, on a gateway in Prague, Czech

Republic, there may be the translation rule “strip leading 00”, while on a

gateway in Moscow, Russia, the rule will be “strip leading 810 or replace

leading 8 with 7”.

Since customer-based translation rules were introduced, node-based

translation has become obsolete. Therefore, a node-based translation rule

is applied only if there is no customer-based translation rule defined for a

given customer.

Number translation on your network

Below is an illustration of how different translation rules are applied

during a call.

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