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

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			Prefix		City prefix		Number			Comment
			0049		2871		2397		567	Called number 0049 2871 2397567
			+49		2871		2397		567	Called number +49 2871 2397567
			49		2871		2397		567	Called number 49 2871 2397567
			0		2871		2397		567		2871	2397	567	Called number 02871 2397567
							2397		567	Called number 2397567
		(?:	0049\|\+49\|49\|0	)?						It will be checked if 0049 or +49 or 49 or 0 is part of incomming number. If yes, this part will be cut off.
	(?:				2871	)?				It will be checked if 2871 is part of incomming number. If yes, this part will be cut off.
^(?:							2397	)?		It will be checked if 2397 is part of incomming number. If yes, this part will be cut off.
									(.*)	All numbers, who are still there, they will be saved in $1
^(?:	(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	2397	)?	(.*)	Expression.

^(?: ( ?: (?: 0049|\+49|49|0)?2871)? 2397 )?(.*) In $1 will be saved 567.

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		Prefix		City prefix		Number	Comment
		0049		2871		2397567	Called number 0049 2871 2397567
		+49		2871		2397567	Called number +49 2871 2397567
		49		2871		2397567	Called number 49 2871 2397567
		0		2871		2397567		2871	Called number 02871 2397567
						2397567	Called number 2397567
	(?:	0049\|\+49\|49\|0	)?				It will be checked if 0049 or +49 or 49 or 0 is part of incomming number. If yes, this part will be cut off.
^(?:				2871	)?		It will be checked if 2871 is part of incomming number. If yes, this part will be cut off.
						(.*)	All numbers, who are still there, they will be saved in $1
^(?:	(?:	0049\|\+49\|49\|0	)?	2871	)?	(.*)	Expression.

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

Explanation:

(.*) – all numbers which still are there

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