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When you set one up an outside line manually you have to “cut” incoming caller-ID in "Gateway groups" to the incoming number in Gateway group to match the pattern that you have defined in “Inbound routes”.

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E.g. the incoming If phone number is 02871 2397567 and we like to let pass only you want to map the last 3 digit digits (567) we to extension 12, you have to “cut” cut off  02871 2397.

There are severl ways how can number come in, that way we have to check all possibility’s.

First step would be to set the "Pattern" in "Inbound routes" to ^(567) and "Target" to 12. The next step is to define the filtering rules in "Gateway groups".

Depending on provider, incoming numbers can be formatted in different ways. Therefore, all possible formats should be checked. 

                                      ^(?: ( ?: (?: 0049|\+49|49|0)?2871)? 2397 )?(.*)     In $1 567 will be saved 567in $1 and compared to the pattern in "Inbound routes".

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If we what you want to use the complete number 2397567 in “Inbound routes” that .

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The filtering rules should look like this:

                                                               ^( ?: (?: 0049|\+49|49|0)?2871)?(.*)                       In $1 will be saved  2397567.2397567 will be saved  in $1 and compared to the pattern in "Inbound routes".

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Explanation:

(.*) – all numbers which are still are there

$1 – is variable in this variable will be saved a variable, all from (.*) will be saved in this variable

(?:XXXXX)? – means if XXXXX exist exists, this part will be “cut”.

| – is "or"

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