Figure 41 Relationship of ISDN PRI Components for T1
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Channel | Time slot | interface | |||
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| B | (data channel) | 1 | S0:0 | |
| B | (data channel) | 2 | S0:1 | |
| B | (data channel) | 3 | S0:2 | |
| B | (data channel) | 4 | S0:3 | |
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| B | (data channel) | 21 | S0:20 |
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| B | (data channel) | 22 | S0:21 | |
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| B | (data channel) | 23 | S0:22 | |
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| D | (signaling channel) | 24 | S0:23 | |
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Logical contents of a PRI interface
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Note When you configure your CT1 controller for a
To configure ISDN signaling, follow these steps:
Step 1 Enter the enable command and password to go to privileged EXEC mode. You are in privileged EXEC mode when the prompt changes to Gateway#.
Gateway> enable
Password: password
Gateway#
Step 2 Enter global configuration mode. You are in global configuration mode when the prompt changes to Gateway(config)#.
Gateway# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Gateway(config)#
Step 3 Enter serial interface configuration mode. After the CT1 controller is configured, a corresponding
Note On a CE1 PRI line, the serial interface for the D channel is 1/0:15.
Gateway(config)# interface serial 1/0:23
Step 4 Assign an IP address and subnet mask to the interface:
Gateway(config-if)# ip address 172.16.254.254 255.255.255.0
Step 5 Configure all incoming voice calls.
Note This command has two possible keywords: data and modem. You must use the modem keyword to enable both modem and voice calls. The modem keyword represents bearer capabilities of speech.
Gateway(config-if)# isdn incoming-voice modem
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