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Calls from the PSTN getting 'No circuit/channel available'

Hi,

I have a CCM running 4.2 connecting through MGCP to a 2821 Gateway.

After some debugging and traces enabled on the CCM I noticed that the calls that are getting disconnected from the PSTN all fall in the first 5 channels of the E1 PRI.

These are the relevant commands on the 2821:

controller E1 0/0/0

pri-group timeslots 1-16 service mgcp

!

interface Serial0/0/0:15

no ip address

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

isdn bchan-number-order ascending

no cdp enable

!

ccm-manager mgcp

ccm-manager config server <CCM ip address>

!

mgcp

mgcp call-agent <CCM ip address> service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp package-capability rtp-package

mgcp default-package line-package

mgcp sdp simple

!

mgcp profile default

These are two snippets from a 'debug isdn q931':

*May 10 11:32:02.582: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8 callref = 0x007F

Sending Complete

Bearer Capability i = 0x9090A3

Standard = CCITT

Transfer Capability = 3.1kHz Audio

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA18384

Preferred, Channel 4

Progress Ind i = 0x8183 - Origination address is non-ISDN

Calling Party Number i = 0x0083, 'calling party number'

Plan:Unknown, Type:Unknown

Called Party Number i = 0x81, 'called party number'

Plan:ISDN, Type:Unknown

*May 10 11:32:02.602: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8 callref = 0x807F

Channel ID i = 0xA98384

Exclusive, Channel 4

*May 10 11:32:02.602: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x807F

Cause i = 0x80A2 - No circuit/channel available

*May 10 11:32:02.790: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8 callref = 0x007F

*May 10 11:32:02.802: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x807F

*May 10 11:33:35.062: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8 callref = 0x0057

Sending Complete

Bearer Capability i = 0x9090A3

Standard = CCITT

Transfer Capability = 3.1kHz Audio

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA18383

Preferred, Channel 3

Progress Ind i = 0x8283 - Origination address is non-ISDN

Calling Party Number i = 0x0083, 'calling party number'

Plan:Unknown, Type:Unknown

Called Party Number i = 0x81, 'called party number'

Plan:ISDN, Type:Unknown

*May 10 11:33:35.086: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8 callref = 0x8057

Channel ID i = 0xA98383

Exclusive, Channel 3

*May 10 11:33:35.086: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x8057

Cause i = 0x80A2 - No circuit/channel available

In attachment I include a file (copy of ccm00000065.txt) that has the relevant information taken from a CCM Trace log and run through Voice Log Translator.

With all this information I went to check the MGCP Gateway configuration in CCMAdmin. Some of the configuration elements included on the E1 endpoint configuration page and that are somewhat confusing me (mind you that this is an inherited configuration) are as follows:

Channel Selection Order: BOTTOM_UP (since the configuration on the gateway's interface Serial0/0/0:15 is for bchan-number-order ascending, shouldn't these parameters match by using the TOP_DOWN option?)

Channel IE Type: Use Number When 1B (This is an option that I don't fully understand. Any help on this would be appreciated. But to what I understand, and since the E1 PRI configuration is only used for half a primary (15 channels) shouldn't this parameter be set to 'Timeslot Number'?)

TIA

2 REPLIES
Hall of Fame Super Gold

Re: Calls from the PSTN getting 'No circuit/channel available'

Hi,

do you have a pvdm2-32 ? Any other port or config using DSP resources on the 2811?

In this case you can set having less channels allocated on CCM and start top down.

New Member

Re: Calls from the PSTN getting 'No circuit/channel available'

Hello,

Is what you have found a solution?, because I have exactly the same issue with a half E1!!

Thanks

Régis

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