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

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If phone number is 02871 2397567 and you want  to let pass only last 3 digit (567) to extension 12, you have to cut off  02871 2397 and in "Inbound routes" set "Pattern" to ^(567) and "Target" to 12.

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

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

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That should look like this:

                                      ^( ?: (?: 0049|\+49|49|0)?2871)?(.*)                       In $1 will be saved  2397567.

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Explanation:

(.*) – all numbers which still are there

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