[cisco-voip] Calls from the PSTN getting 'No circuit/channel available'

[Kalle Tetto]

Hi, I had this often before, try to play around with bchan order. change 
from bottom up to top down. I also had, that I simply could not use any 
of 4 channels out of 30. So contact also your telco and ask for the 
channels and if they have any problem.

I have also seen, that someone has bought 16 channels and the telco only 
had 12 delivered.

So I think it is a isdn layer 3 channel selection problem, of a channel 
that simply not exists.

Cheers

pedro marques schrieb:
> 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
> 
> 
> -- 
> Pedro Miguel Marques
> 
> 
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