Cisco Call Manager Experss 8.6

Dear friends
I have the following problem
I have an cisco 2851 with 20 extensions
I want three from 20 extensions to be communicate with all extensions but not make outcoming call from pstn lines and from one voip sip line I have for example

the 301 ext. make call to 310
and 310 ext. make call to 301
but if 310 try to reach the local number from pstn or voip line 2101234567 then I want to reject this call
only extension with extension allowed

please help is urgent

Hi Antonis,

What you want is to implement COR Lists on CME in order to restrict internal calls between the specified extensions and allow all other extensions make calls through the PSTN/SIP.

Cor Lists are a bit of a challenge until you understand how they work. You can read up on them here:
www.cisco.com/c/en/us/support/docs/voice...configuring-cor.html

We are also planning to cover COR Lists in the near future on Firewall.cx.

Here is a template I use to help me speed up the rollout of COR Lists on new installations. You must read the above link first in order to understand their logic and the below configuration will make more sence to you.

Good Luck!

!
dial-peer cor custom
name local
name interstate
name services
name mobiles
name international
name internal
!
!
dial-peer cor list call-all
member local
member interstate
member services
member mobiles
member international
member internal
!
dial-peer cor list call-loc-interst-ser
member local
member interstate
member services
member internal
!
dial-peer cor list call-loc-interst-ser-mob
member local
member interstate
member services
member internal
member mobiles
!
!
dial-peer cor list call-internal-only
member internal
!
!
dial-peer cor list pots-local-out
member local
!
dial-peer cor list pots-interstate-out
member interstate
!
dial-peer cor list pots-services-out
member services
!
dial-peer cor list pots-mobile-out
member mobiles
!
dial-peer cor list pots-international-out
member international
!




!
dial-peer voice 1 pots
corlist outgoing pots-local-out
!
dial-peer voice 2 pots
corlist outgoing pots-local-out
!
dial-peer voice 3 pots
corlist outgoing pots-local-out
!
dial-peer voice 4 pots
corlist outgoing pots-interstate-out
!
dial-peer voice 5 pots
corlist outgoing pots-interstate-out
!
dial-peer voice 6 pots
corlist outgoing pots-interstate-out
!
dial-peer voice 7 pots
corlist outgoing pots-services-out
!
dial-peer voice 8 pots
corlist outgoing pots-services-out
!
dial-peer voice 9 pots
corlist outgoing pots-services-out
!
dial-peer voice 10 pots
corlist outgoing pots-mobile-out
!
dial-peer voice 11 pots
corlist outgoing pots-mobile-out
!
dial-peer voice 12 pots
corlist outgoing pots-international-out
!
dial-peer voice 13 pots
corlist outgoing pots-international-out
!
!


!
ephone-dn 10
cor incoming call-all-no-mob
or
cor incoming call-internal-only
etc