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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”

02871 2397.

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 checkedThere are sever way how can number come in, that way we have to check all possibility’s.

					Prefix		City prefix		Number			Comment
			0049		2871		2397		567	567	Incoming number 0049 2871 2397567
			+49		2871		2397		567	567	Incoming number +49 2871 2397567
			49		2871		2397		567	567	Incoming number 49 2871 2397567
			0		2871		2397	567	567	Incoming number 02871 2397567
				2871		2397	567		2397		567	Incoming number 2397567
			2397		567				(?:	0049\|\+49\|49\|0	)?		Will be checkt if Check wether 0049 or +49 or 49 or 0 is part of incomming the incoming number. If yes, this part will be cut off.
	(?:				2871	)?				Will be checkt if Check wether 2871 is part of incomming the incoming number. If yes, this part will be cut off.
^(?:							2397	)?		Will be checkt if Check wether 2397 is part of incomming the incoming number. If yes, this part will be cut off.
									(.*)	All number those are still there All numbers that are left, will be saved in $1
^(?:	(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	2397	)?	(.*)	ExpressionComplete expression.

^(?: ( ?: (?: 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 If you want to use the complete number 2397567 in “Inbound routes” that .

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The filtering rules should look like this:

				Prefix		City prefix		Number	Comment
		0049		2871		2397567	2397567	Incoming number 0049 2871 2397567
		+49		2871		2397567	2397567	Incoming number +49 2871 2397567
		49		2871		2397567	2397567	Incoming number 49 2871 2397567
		0		2871		2397567		2397567	Incoming number 02871 2397567
	2871	2397567				2397567	Incoming number 2397567
		2397567			(?:	0049\|\+49\|49\|0	)?			Will be checkt if Check wether 0049 or +49 or 49 or 0 is part of incomming the incoming number. If yes, this part will be cut off.
^(?:				2871	)?		Will be checkt if Check wether 2871 is part of incomming the incoming number. If yes, this part will be cut off.
						(.*)	All number those are still there numbers that are left, will be saved in $1
^(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	(.*)	ExpressionComplete expression.

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

| – ist is "or"

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