[cisco-voip] ISDN PRI channel stuck in busy status?

[keli at carocomp.ro]

Any ideas on this?

The ten channels seem to "fill up" with busy channels after about half  
a day or so of normal call traffic (2-3 simultaneous calls usually).

thanks,
   Zoltan

Quoting Kelemen Zoltan <keli at carocomp.ro>:

> Hi!
>
> We have a CCME, 4.2(0), IOS: 12.4(11)XW6 with a partial E1.
>
> When examining some complaints, that the client was unable to place
> more than a few calls outside and most of incoming calls failed to
> reach them, I found the ISDN interface with more busy channels than
> active voice calls.
>
> Below I attached an example, where channel 9 is stuck (on channel 10 I
> might have just catched a call that just disconnected, but channel 9
> was continuously stuck busy with no active call on it.).
>
> This is relatively light, since there's still 9 other channels for
> light traffic, but I have seen this interface with  8 or even all ten
> channels stuck.  So far I  haven't found  any other way to solve it but
> to  restart the  serial interface.
>
> Any ideas what could be going wrong? Or at least if it's possible to
> recover a channel from that state, other than restarting the interface?
>
> Thanks,
>  Zoltan
>
>
> ccme#sh isdn stat ser 0/0/0:15
> Global ISDN Switchtype = primary-net5
> ISDN Serial0/0/0:15 interface
>    dsl 0, interface ISDN Switchtype = primary-net5
>    Layer 1 Status:
>    ACTIVE
>    Layer 2 Status:
>    TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
>    Layer 3 Status:
>    1 Active Layer 3 Call(s)
>    CCB:callid=2707, sapi=0, ces=0, B-chan=9, calltype=VOICE
>    CCB:callid=A622, sapi=0, ces=0, B-chan=8, calltype=VOICE
>    CCB:callid=A627, sapi=0, ces=0, B-chan=10, calltype=VOICE
>    CCB:callid=270E, sapi=0, ces=0, B-chan=7, calltype=VOICE
>    Active dsl 0 CCBs = 4
>    The Free Channel Mask:  0x8000003F
>    Number of L2 Discards = 0, L2 Session ID = 113
>
>
>        ccme#sh isdn serv ser 0/0/0:15
> PRI Channel Statistics:
> ISDN Se0/0/0:15, Channel [1-31]
>  Configured Isdn Interface (dsl) 0
>   Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)
>    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>    State   :  0 0 0 0 0 0 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
>   Service State (0=Inservice 1=Maint 2=Outofservice 8=MaintPend 9=OOSPend)
>    Channel :  1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>    State   :  0 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
>
>
>
> ccme#sh voice call 0/0/0:15  0/0/0:15 1 -          -  -
>    0/0/0:15 2 -          -  -                    0/0/0:15 3 -
> -  -                    0/0/0:15 4 -          -  -
> 0/0/0:15 5 -          -  -                    0/0/0:15 6 -          -
> -                    0/0/0:15 7
>      vtsp level 0 state = S_CONNECT
> callid 0x270E B07 state S_TSP_CONNECT clld 100 cllg 7518XXXXX
> 0/0/0:15 8
>      vtsp level 0 state = S_CONNECT
> callid 0xA622 B08 state S_TSP_CONNECT clld 07499XXXXX cllg 113
> 0/0/0:15 9 -          -  -                    0/0/0:15 10-          -
> -                    -------------------------------- configuration
>
> controller E1 0/0/0
> framing NO-CRC4
> clock source internal
> pri-group timeslots 1-10,16
> !
> interface Serial0/0/0:15
> no ip address
> encapsulation hdlc
> isdn switch-type primary-net5
> isdn overlap-receiving
> isdn incoming-voice voice
> isdn send-alerting
> isdn sending-complete
> no cdp enable
> !
>
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