Configuration example for router-to-router ISDN caller identification callback with DCC
Network requirements
As shown in Figure 53:
Router A and Router B are interconnected through ISDN BRI interfaces across an ISDN network.
Interface BRI 1/0 on Router A is assigned the IP address of 100.1.1.1/24 and interface BRI 1/0 on Router B is assigned the IP address of 100.1.1.2/24.
Configure ISDN caller identification callback with C-DCC between Router A and Router B, specifying Router A as the callback client and Router B as the callback server.
Figure 53: Network diagram
![](images/image49.png)
Configuration procedure
Configure Router A:
# Configure a dial access control rule for dialer access group 1.
<RouterA> system-view [RouterA] dialer-rule 1 ip permit
# Assign an IP address to interface BRI 1/0, and configure C-DCC parameters and the dial string for placing calls to Router B.
[RouterA] interface bri 1/0 [RouterA-Bri1/0] ip address 100.1.1.1 255.255.255.0 [RouterA-Bri1/0] dialer enable-circular [RouterA-Bri1/0] dialer-group 1 [RouterA-Bri1/0] dialer route ip 100.1.1.2 8810052 [RouterA-Bri1/0] dialer timer enable 15
Configure Router B:
# Configure a dial access control rule for dialer access group 2.
<RouterB> system-view [RouterB] dialer-rule 2 ip permit
# Assign an IP address to interface BRI 1/0, and configure C-DCC parameters and the dial string for placing calls to Router A.
[RouterB] interface bri 1/0 [RouterB-Bri1/0] ip address 100.1.1.2 255.255.255.0 [RouterB-Bri1/0] dialer enable-circular [RouterB-Bri1/0] dialer-group 2 [RouterB-Bri1/0] dialer route ip 100.1.1.1 8810048
# Enable the local end to place return calls for ISDN calling number 8810048.
[RouterB-Bri1/0] dialer call-in 8810048 callback