A problem with ISDN channels between 2821 and PSTN

Unanswered Question
Aug 11th, 2009
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There are a PSTN, Cisco 2821 with two E1 ISDN streams and CCM6:

Single scheme:



CCM6 <=(eth)=> GW2821 <=(two E1 controllers)=> PSTN



The problem is that the engineer of digital stations says that first 11 channels in first E1 stream are blocked by station due to some troubles with them.

When I try to see the ISDN status or E1 controllers statuses on GW2821 everything is ok.

How could I find out what is wrong with these first 11 channels in first E1 ?

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paolo bevilacqua Tue, 08/11/2009 - 01:47
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Take "debug isdn q931" with "term mon" for a failed call and check.

vyacheslav.k Tue, 08/11/2009 - 18:35
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#debug isdn q931


Aug 12 10:10:29.067: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8 callref = 0x0009

Sending Complete

Bearer Capability i = 0x8090A3

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA98381

Exclusive, Channel 1

Calling Party Number i = 0x2181, '3842551177'

Plan:ISDN, Type:National

Called Party Number i = 0xA1, '9030678602'

Plan:ISDN, Type:National

Aug 12 10:10:29.103: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x8009

Cause i = 0x82AC - Requested circuit/channel not available

Display i = 'REQUESTED CHANNEL NOT AVAILABLE'

Aug 12 10:10:29.123: ISDN Se0/0/1:15 Q931: TX -> SETUP pd = 8 callref = 0x014B

Sending Complete

Bearer Capability i = 0x8090A3

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA98381

Exclusive, Channel 1

Calling Party Number i = 0x2181, '3842551177'

Plan:ISDN, Type:National

Called Party Number i = 0xA1, '9030678602'

Plan:ISDN, Type:National

Aug 12 10:10:29.159: ISDN Se0/0/1:15 Q931: RX <- CALL_PROC pd = 8 callref = 0x814B

Channel ID i = 0xA98381

Exclusive, Channel 1

Aug 12 10:10:32.227: ISDN Se0/0/1:15 Q931: RX <- ALERTING pd = 8 callref = 0x814B

Progress Ind i = 0x8488 - In-band info or appropriate now available

Aug 12 10:10:36.331: ISDN Se0/0/1:15 Q931: RX <- CONNECT pd = 8 callref = 0x814B

Connected Number i = '!', 0x83, '9030678602'

Aug 12 10:10:36.339: ISDN Se0/0/1:15 Q931: TX -> CONNECT_ACK pd = 8 callref = 0x014B

Aug 12 10:10:40.019: ISDN Se0/0/1:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x014B

Cause i = 0x8A90 - Normal call clearing

Aug 12 10:10:40.039: ISDN Se0/0/1:15 Q931: RX <- RELEASE pd = 8 callref = 0x814B

Aug 12 10:10:40.047: ISDN Se0/0/1:15 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x014B


As I understand the problem is:

Cause i = 0x82AC - Requested circuit/channel not available

Display i = 'REQUESTED CHANNEL NOT AVAILABLE'


But how to detect why this happens?

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