destination-pattern confusion 1

[imbadatthis]

Got to love this CVOICE book at least its making my google skills stronger.

can someone explain what below code does please?

!this creates the dial peer I get it. 
dial-peer voice 910 pots
!these lines are throwing me off
destination-pattern 9[2-9]..[2-9]......
direct-inward-dial
!send it out of dsgroup0 #23 on T1 Controller 0/0/0
port0/0/0:23

We must go always forward, not backward
always up, not down and always twirling twirling towards infinity.

 

[whykap]

When the router receives this destination-pattern it sends the call out the controller.
To break it down:
9 will be the access code the user is dialing on the phone.
The next digit has to match a number between 2 and 9 [2-9]

. is a wild card

so if someone dials
95552341234 the call will go out the controller t1 which seems to be a PRI

 

[imbadatthis]

what is the purpose of the second [2-9] in there then ?


We must go always forward, not backward
always up, not down and always twirling twirling towards infinity.

 

[whykap]

same as the first. That specific digit has to be between 2 and nine.0 or 1 will not match the pattern.
The reason depends on the scenario they are giving this example for. hard for me to say why without knowing specifics.
It is a valid pattern nevertheless

 

[imbadatthis]

thanks mate.


We must go always forward, not backward
always up, not down and always twirling twirling towards infinity.