Appending out bound dailing numbers

I have been using analog lines for quite some time now and have currently added a voipstreet DID as additional out bound line to my four port card

Now when all lines are full it requires the 5th person who uses the voipstreet line to dial the full ten digit area code along with a 1 for example 1 801 -NXX-NXXX

I need to setup my out bound call on the 5 th voipstreet line to automatically append the 1801 when a normal 7 digit number is dialed.

I haven’t had anyt luck in setting it up with the dialing rules.

Any help on this would be appreciated thank you.

John has a great tool you can make use of.