Cisco Systems manual 133 165 IP Telephony v1.0 Case Study

r1#sh isdn status

Global ISDN Switchtype = primary-ni ISDN Serial1/0/0:23 interface

dsl 0, interface ISDN Switchtype = primary-ni Layer 1 Status:

ACTIVE Layer 2 Status:

TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED Layer 3 Status:

0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF Number of L2 Discards = 0, L2 Session ID = 5 Total Allocated ISDN CCBs = 0

Another useful command is the debug ephone register. This command allows you to track the e-phones register process.

Disconnect on of the IP Phones. Issue the debug ephone register and then connect the IP Phone again. Take a look on the debug messages on the R1 console.

The show running-config, show ip interface brief, show ip route, show ip protocols are very useful and powerful troubleshoot commands as well.

Below are the basic configuration files for R1 and R2. If you are planning to start from these files be careful: on the Cisco Router 2800 series the interface naming convention is changed.

Basic R1 configuration file:

version 12.3

service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption

!

hostname r1

!

boot-start-marker boot-end-marker

!

enable secret 5 $1$E70n$H.Rezw/Yhb4EAJVbIrmHa1

!

no aaa new-model

!

resource policy

!

no network-clock-participate slot 1 voice-card 1

dspfarm

!

ip subnet-zero

!

!

ip cef

no ip dhcp use vrf connected

!

no ip domain lookup

133 - 165 IP Telephony v1.0 Case Study 1: Copyright ♥ 2005, Cisco Systems, Inc.