Generating Secondary Dial Tone with Digit Maps

You can regenerate a dial tone by adding a comma "," to the digit map.

You can dial seven-digit numbers after dialing "8" as shown next in the example rule 8,[2-9]xxxxxxT :

[2-9]11|0T|011xxx.T|[0-1][2-9]xxxxxxxxx|8,[2-9]xxxxxxT|[2-9]xx.T

By adding the digit "8", the dial tone plays again, and users can complete the remaining seven-digit number. In this example, if users also have a 4-digit extension that begins with "8", then users will hear dial tone after the first "8" was dialed because "8" matches the "8" in the digit map.

If you want to generate dial tone without the need to send the "8", replace one string with another using the special character "R" as shown next in the rule R8RR. In the following example, replace "8" with an empty string to dial the seven-digit number:

[2-9]11|0T|011xxx.T|[0-1][2-9]xxxxxxxxx|R8RR,[2-9]xxxxxxT|[2-9]xx.T