FAQ T640 T440 Inbound DIDs/Regular expressions - Search/replace pattern to cut prefixes

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

E.g. the incoming phone number is 02871 2397567 and you want to map the last 3 digits (567) to extension 12, you have to cut off  02871 2397. 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 )?(.*)    567 will be saved in $1 and compared to the pattern in "Inbound routes".

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

The filtering rules should look like this:

                        ^( ?: (?: 0049|\+49|49|0)?2871)?(.*)                      2397567 will be saved  in $1 and compared to the pattern in "Inbound routes".

Explanation:

(.*) – all numbers which are still there

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

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

| – is "or"