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CUCM 11 GW h323 Requested circuit/channel not available

Hi All

 I have a problem.

I have a CUCM 11 and H323 PRI E1. For outgoing call, the follow message is show it:

 Requested circuit/channel not available

Here a ISDN Q931 debug

Sep  5 14:33:37.771: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8  callref = 0x3470

        Bearer Capability i = 0x8090A3

                Standard = CCITT

                Transfer Capability = Speech 

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA9839F

                Exclusive, Channel 31

        Calling Party Number i = 0x0081, '229793200'

                Plan:Unknown, Type:Unknown

        Called Party Number i = 0x80, '226928000'

                Plan:Unknown, Type:Unknown

Sep  5 14:33:37.855: ISDN Se0/0/0:15 Q931: RX <- SETUP_ACK pd = 8  callref = 0xB470

        Channel ID i = 0xA9839F

                Exclusive, Channel 31

Sep  5 14:33:37.859: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0xB470

        Progress Ind i = 0x8288 - In-band info or appropriate now available

Sep  5 14:33:37.871: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x3470

        Cause i = 0x80AC - Requested circuit/channel not available

Sep  5 14:33:38.047: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8  callref = 0xB470

Sep  5 14:33:38.051: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x347




Re: CUCM 11 GW h323 Requested circuit/channel not available

It can be several things but first, make sure the number of channels you have configured in your voice gw matches the number of channels you are purchasing from the Service Provider. If you have more channels in your voice gw than the service provider, eventually the voice gw will try to use a channel that is not in service on the Service Provider's end.


Re: CUCM 11 GW h323 Requested circuit/channel not available

It's a long time since I used it but there's a configuration command to tell the Cisco whether to number B channels contiguously, ie from 1 to 30, or mapped directly to time slots ie 1-15 and 17-31.   The convention needs to match the provider, otherwise any call for channel 16 or above will fair.

The command was "isdn contiguous-bchan" but you will need to check it still applies to your particular IOS.  

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