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

If E.g. the incoming phone number is 02871 2397567 and you want  to let pass only want to map the last 3 digit digits (567) to extension 12, you have to cut off  02871 2397 and . First step would be to set the "Pattern" in "Inbound routes" set " Pattern" 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 checkedThere are severl ways how can number come in, that way you have to check all possibility’s.

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

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

That 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".

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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