Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

The callref uses a different value for the first digit (to differentiate between TX and RX) and the second value is the same (SETUP had a 0 for the last digit and CONNECT_ACK also has a 0). The router is completely dependent upon the PSTN or PBX to assign a Bearer channel (B- channel). If the PSTN or PBX doesn't assign a channel to the router, the call won't be routed. In our case, a CONNECT message is received from the switch with the same reference number as was received for ALERTING (0x800B). Finally, you can see the exchange of the DISCONNECT message followed by RELEASE and RELEASE _COMP messages as the call is being disconnected. RELEASE_COMP messages are followed by a cause ID for the call rejection. The cause ID is a hex value. The meaning of the cause can be found by decoding the hex value and following up with your provider.

*Mar 1

225209.694

ISDN Se115 TX -> SETUP pd = 8 callref = 0x000B

*Mar

1

225209.694

Bearer Capability i = 0x8090A3

*Mar 1

225209.694

Channel ID i = 0xA98381

*Mar

1

225209.694

Calling Party Number i = 0x2183, ’1001'

*Mar

1

225209.694

Called Party Number i = 0x80, ’3333'

*Mar 1

225209.982

ISDN Se115 RX <- ALERTING pd = 8 callref = 0x800B

*Mar 1

225209.982

Channel ID i = 0xA98381

*Mar 1

225210.674 ISDN Se115 RX <- CONNECT pd = 8 callref = 0x800B

*Mar 1

225210.678 ISDN Se115 TX -> CONNECT_ACK pd = 8 callref = 0x000B

*Mar 1

225215.058 ISDN Se115 RX <- DISCONNECT pd = 8 callref = 0x800B

*Mar 1

225215.058

Cause i = 0x8090 - Normal call clearing 225217 %ISDN-6

DISCONNECT Int S10 disconnected from unknown , call lasted 4 sec

*Mar 1

225215.058

ISDN Se115 TX -> RELEASE pd = 8 callref = 0x000B

*Mar 1

225215.082 ISDN Se115 RX <- RELEASE_COMP pd = 8 callref = 0x800B

*Mar

1 225215.082

Cause i = 0x829F - Normal, unspecified or Special intercept, call blocked group

restriction

Cisco IOS Gateway with T1/CAS Interface

As explained earlier, there are two types of calls going through the Cisco IOS Gateways: the Cisco IOS Gateway interface to the PSTN or PBX with either T1/CAS or T1/PRI interfaces. The following are the debug outputs when the Cisco IOS Gateways has T1/CAS interface. The “debug cas” on the Cisco IOS Gateway has been turned on.

The following debug message shows that the Cisco IOS Gateway is sending an off-hook signal to the switch.

Apr 5 17:58:21.727: from NEAT(0): (0/15): Tx LOOP_CLOSURE (ABCD=1111)

The following debug message indicates the switch is sending wink after receiving the loop closure signal from the Cisco IOS Gateway.

Apr 5 17:58:21.859: from NEAT(0): (0/15): Rx LOOP_CLOSURE (ABCD=1111)

Apr 5 17:58:22.083: from NEAT(0): (0/15): Rx LOOP_OPEN (ABCD=0000)

The following debug message indicates the Cisco IOS Gateway is going off-hook. Apr 5 17:58:23.499: from NEAT(0): (0/15): Rx LOOP_CLOSURE (ABCD=1111)

© 2000 Cisco Systems, Inc.

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Cisco Systems 30 VIP manual Cisco IOS Gateway with T1/CAS Interface

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