[asterisk-ss7] CHANUNAVAIL

[Matthew Fredrickson]

Markus A. Wipfler wrote:
> Hi all,
> 
> i am using libss7-trunk and asterisk-trunk to connect to a telecom  
> switch. I have been getting a lot of complaints from clients that  
> calls are not going through. My ASR is below 20%. When i analyze the  
> hangup causes, i find that more than 50% are Unknown:
> Cause: Unknown (47)
> Cause: Unknown (20)
> Cause: Unknown (0)
> 

Of these causes, if you check Q.850 it will tell you more about them.  I 
just haven't taken the time to go through the exhaustive list of cause 
codes in Q.850 and typed in all the string conversions.  That's what the 
unknown means in most of these.

According to Q.850:

47 means: Resource Unavailable, unspecified (and refers to Q.931).

20 means: Subscriber Absent (mobile application).

Don't even know what 0 might be referring to without a dump of the REL 
message containing it.  Couldn't find it in Q.850, that's for sure.

Hope that helps!

Matthew Fredrickson

> Below is a debug of a failed call, I highly appretiate any help.
> 
> 
> --
> Markus
> 
> 
> 
>      -- Accepting UNAUTHENTICATED call from IP.IP.IP.IP:
>         > requested format = ulaw,
>         > requested prefs = (ulaw|alaw|gsm),
>         > actual format = ulaw,
>         > host prefs = (ulaw|alaw|gsm),
>         > priority = mine
>      -- Executing [0752434592 at from-pbx:1] Set("IAX2/Trunk-GSM-9",  
> "CALLERPRES()=allowed") in new stack
>      -- Executing [0752434592 at from-pbx:2] Dial("IAX2/Trunk-GSM-9",  
> "Zap/g2/752434592") in new stack
> trunk*CLI>      -->XXX-->XXX entered opt params with pcount=1, x=5
> Len = 37 [ e6 f6 22 c5 88 ec 98 10 01 00 01 00 60 01 0a 00 02 09 07 03  
> 10 57 42 43 95 f2 0a 08 04 13 52 46 41 65 82 00 00 ]
> FSN: 118 FIB 1
> BSN: 102 BIB 1
>  >[0] MSU
> [ e6 f6 22 ]
>          Network Indicator: 3 Priority: 0 User Part: ISUP (5)
>          [ c5 ]
>          OPC 611 DPC 11400 SLS 1
>          [ 88 ec 98 10 ]
>                  CIC: 1
>                  [ 01 00 ]
>                  Message Type: IAM
>                  [ 01 ]
>                  --FIXED LENGTH PARMS[4]--
>                  Nature of Connection Indicator:
>                          Satellites in connection: 0
>                          Continuity Check: Check not required (0)
>                          Outgoing half echo control device: not  
> included (0)
>                          [ 00 ]
>                  Forward Call Indicators:
>                          Nat/Intl Call Ind: call to be treated as a  
> national call (0)
>                          End to End Method Ind: no end-to-end  
> method(s) available (0)
>                          Interworking Ind: no interworking encountered  
> (0)
>                          End to End Info Ind: no end-to-end  
> information available (0)
>                          ISDN User Part Ind: ISDN user part used all  
> the way (1)
>                          ISDN User Part Pref Ind: ISDN user part not  
> preferred all the way (1)
>                          ISDN Access Ind: originating access ISDN (1)
>                          SCCP Method Ind: no indication (0)
>                          [ 60 01 ]
>                  Calling Party Category:
>                          Category: Ordinary calling subscriber (10)
>                          [ 0a ]
>                  Transmission Medium Requirements:
>                          Speech (0)
>                          [ 00 ]
>                  --VARIABLE LENGTH PARMS[1]--
>                  Called Party Number:
>                          Nature of address: 3
>                          NI: 0
>                          Numbering plan: 1
>                          Address signals: 752434592#
>                          [ 07 03 10 57 42 43 95 f2 ]
>                  --OPTIONAL PARMS--
>                  Calling Party Number:
>                          Nature of address: 4
>                          NI: 0
>                          Numbering plan: 1
>                          Presentation: 0
>                          Screening: 3
>                          Address signals: 256414562800
>                          [ 0a 08 04 13 52 46 41 65 82 00 ]
> 
>      -- Called g2/752434592
> Len = 16 [ f6 e7 0d c5 63 02 22 1b 01 00 0c 02 00 02 82 af ]
> FSN: 103 FIB 1
> BSN: 118 BIB 1
> <[0] MSU
> [ f6 e7 0d ]
>          Network Indicator: 3 Priority: 0 User Part: ISUP (5)
>          [ c5 ]
>          OPC 11400 DPC 611 SLS 1
>          [ 63 02 22 1b ]
>                  CIC: 1
>                  [ 01 00 ]
>                  Message Type: REL
>                  [ 0c ]
>                  --VARIABLE LENGTH PARMS[1]--
>                  Cause Indicator:
>                          Coding Standard: 0
>                          Location: 2
>                          Cause Class: 2
>                          Cause Subclass: 15
>                          Cause: Unknown (47)
>                          [ 02 82 af ]
> 
>                  -->XXX-->XXX entered opt params with pcount=1, x=0
> Len = 12 [ e7 f7 09 c5 88 ec 98 10 01 00 10 00 ]
> FSN: 119 FIB 1
> BSN: 103 BIB 1
>  >[0] MSU
> [ e7 f7 09 ]
>          Network Indicator: 3 Priority: 0 User Part: ISUP (5)
>          [ c5 ]
>          OPC 611 DPC 11400 SLS 1
>          [ 88 ec 98 10 ]
>                  CIC: 1
>                  [ 01 00 ]
>                  Message Type: RLC
>                  [ 10 ]
> 
> [Mar 18 12:12:16] WARNING[1846]: app_dial.c:818 wait_for_answer:  
> Unable to forward voice or dtmf
>      -- Hungup 'Zap/1-1'
>    == Everyone is busy/congested at this time (1:0/0/1)
>      -- Auto fallthrough, channel 'IAX2/Trunk-GSM-9' status is  
> 'CHANUNAVAIL'
>      -- Hungup 'IAX2/Trunk-GSM-9'
> 
> 
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-- 
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.