Openvox B100P + mISDN drop L1link randomly

Tib85

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Apr 8, 2010
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#1
Hello!

I have elastix 1.6 with Openvox B100P ISDN Bri card.
Usually it works great, but sometimes misdn drop L1Link and then i cant dial-in or dial-out.
In asterisk CLI I tried L1Link up, with misdn port up 1 command, but it did not work.

Code:
elastix*CLI> misdn show stacks
BEGIN STACK_LIST:
  * Port 1 Type TE Prot. PMP L2Link DOWN L1Link:DOWN Blocked:0  Debug:2

When i try call out:

Code:
   -- Executing [s@macro-dialout-trunk:26] Dial("SIP/3002-09716d08", "misdn/1/458|300|") in new stack
P[ 0]  --> * NEW CHANNEL dad:458 oad:(null)
P[ 1] read_config: Getting Config
P[ 1]  --> TON: Unknown
P[ 1]  --> LTON: Unknown
P[ 1]  --> CTON: Unknown
P[ 1] * CALL: 1/458
P[ 1]  --> * dad:2458 tech:mISDN/0-u6 ctx:ISDN-be
P[ 1]  --> pres: -1 screen: -1
P[ 1]  --> pres: 0
P[ 1]  --> PRES: Allowed (0)
P[ 1]  --> SCREEN: Unscreened (0)
P[ 1] NO OPTS GIVEN
P[ 1] I SEND:SETUP oad:3002 dad:458 pid:8
P[ 1]  --> channel:0 mode:TE cause:16 ocause:16 rad: cad:
P[ 1]  --> info_dad: onumplan:0 dnumplan:0 rnumplan:0 cpnnumplan:0
P[ 1]  --> * SEND: State Dialing pid:8
    -- Called 1/458
P[ 1]  --> queue_hangup
P[ 1] * RELEASING CHANNEL pid:8 ctx:ISDN-be dad:458 oad:2458 state: CALLING
P[ 1] empty_chan_in_stack: cannot empty channel 255
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [s@macro-dialout-trunk:27] Goto("SIP/3002-09716d08", "s-CHANUNAVAIL|1") in new stack
    -- Goto (macro-dialout-trunk,s-CHANUNAVAIL,1)
When the L1link is up, everything works well.

Why cant get L1link? misdn restart or elastix restart did not solve this problem. Its sometimes works sometimes does not.

How can I fix L1Link?

Sorry for my bad english:)

Regards, Tib
 

Joe.Yung

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Nov 5, 2009
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#2
Hello Tib,
If possible,please send your SSH account to me and let me have a check.

joe.yung@openvox.cn
Joe
 

james.zhu

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#3
hello:
please check the modem and service provider. sometimes, the ISDN modem or far-side server(NT) will be into sleeping mode to save power.
 

Tib85

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Apr 8, 2010
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#4
Hi guys,

thank you for your help.
I think my ISDN PBX is the source of problem.
I tried with dahdi, the result is same.
When everything OK, in asterisk CLI is saw the next DAHDI message:
Code:
> [ 00 81 01 1b ]

> Supervisory frame:
> SAPI: 00  C/R: 0 EA: 0
>  TEI: 064        EA: 1
> Zero: 0     S: 0 01: 1  [ RR (receive ready) ]
> N(R): 013 P/F: 1
> 0 bytes of data

When disconnected:
Code:
-- Timeout occured, restarting PRI
q921.c:468 t200_expire: q921_state now is Q921_LINK_CONNECTION_RELEASED
q921.c:858 q921_reset: q921_state now is Q921_LINK_CONNECTION_RELEASED
Sending TEI management message 1, TEI=127

> [ fc ff 03 0f 37 cb 01 ff ]

> Unnumbered frame:
> SAPI: 63  C/R: 0 EA: 0
>  TEI: 127        EA: 1
>   M3: 0   P/F: 0 M2: 0 11: 3  [ UI (unnumbered information) ]
> 5 bytes of data
> MDL Message: TEI Identity Request (1)
> RI: 14283
> Ai: 127 E:1
Sending TEI management message 1, TEI=127

> [ fc ff 03 0f 44 3a 01 ff ]

> Unnumbered frame:
> SAPI: 63  C/R: 0 EA: 0
>  TEI: 127        EA: 1
>   M3: 0   P/F: 0 M2: 0 11: 3  [ UI (unnumbered information) ]
> 5 bytes of data
> MDL Message: TEI Identity Request (1)
> RI: 17466
> Ai: 127 E:1
Sending TEI management message 1, TEI=127
If I know the TEI:127 is a broadcast message, and I think problem that I am not getting a TEI number.
 

Tib85

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#5
The problem is resolved, the problem was our ISDN PBX.
 

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