capi drivers does not detect communication in certain conditions on italian telcos
Alessandro Polverini
I'm using asterisk with chan_capi and a Fritz isdn pci card to connect
to my telcos (Albacom and Telecom Italia).
Almost everything works fine (early B3, etc) but there is a particular
situation where the communication does not work.
That's the exact scenario: when a I call a mobile phone and it's not
reachable or turned off.
What it should happen in this case is to hear the voice of the carrier
telling something like "the user is unreachable, please try again
later".
What I get with chan_capi is instead: nothing at all. No voice, no
tones, nothing at all. I just can understand that the call is over
from the asterisk console.
I suppose this is a problem of the fritz capi driver, so I used the
d3trace tool to monitor 2 calls to a mobile phone: the first one on a
reachable phone (where everything works fine), and the other one to an
unreachable cellular (where I do not have any signs of activity on the
phone).
I attach the dump of the trace below.
I hope someone can help me fixing this problem otherwise I'll not be
able to use that card on my system (and I don't know any other cheap
card for a simple BRI).
Thanks,
Alex
-------------------------------------------------------------------------------
dtrace 2.01 (C) AVM Berlin 13 Oct 2004 -
15:25:56
CAPI Version: 2.0 Manufacturer version: 0.17-00 (1.16)
Manufacturer: AVM Berlin Serial Number: 0004711
Number of installed controllers: 1
Number of B-channels supported by controller 1: 2
-------------------------------------------------------------------------------
AVM ISDN-Controller|Network
===================|=======
(SEND) D3 00:00:11:02
Protocol discriminator Q.931: 08
Call reference (from originator): 04
SETUP: 05
bearer capability: 04 03 80 90 A3
Information transfer capability: speech
Transfer mode: Circuit mode
Information transfer rate: 64 kbit/s
channel identification: 18 01 83
Interface type: basic interface
Preferred/exclusive: preferred
D-channel indicator: not the D-channel
Information channel selection: any channel
calling party number: 6C 0B 00 80 31 30 37 34 30 31 37 35 39
Type of number: unknown
Numbering plan: unknown
Calling party number: 107401759
called party number: 70 0B 80 33 34 37 31 32 33 35 34 34 34
Type of number: unknown
Numbering plan: unknown
Called party number: 3471235444
high layer compatibility: 7D 02 91 81
High layer characteristics identification: telephony
(RECEIVE) D3 00:00:11:03
Protocol discriminator Q.931: 08
Call reference (to originator): 04
SETUP ACKNOWLEDGE: 0D
channel identification: 18 01 89
Interface type: basic interface
Preferred/exclusive: exclusive
D-channel indicator: not the D-channel
Information channel selection: B1 channel
(RECEIVE) D3 00:00:18:00
Protocol discriminator Q.931: 08
Call reference (to originator): 04
CALL PROCEEDING: 02
progress indicator: 1E 02 82 88
Location: public network/local user
Progress description: In-band information or
appropriate pattern now available
(RECEIVE) D3 00:00:18:01
Protocol discriminator Q.931: 08
Call reference (to originator): 04
PROGRESS: 03
progress indicator: 1E 02 82 88
Location: public network/local user
Progress description: In-band information or
appropriate pattern now available
(RECEIVE) D3 00:00:18:01
Protocol discriminator Q.931: 08
Call reference (to originator): 04
ALERTING: 01
(SEND) D3 00:00:24:03
Protocol discriminator Q.931: 08
Call reference (from originator): 04
DISCONNECT: 45
cause: 08 02 80 90
Location: user
Cause: Normal call clearing
(RECEIVE) D3 00:00:24:05
Protocol discriminator Q.931: 08
Call reference (to originator): 04
RELEASE: 4D
(SEND) D3 00:00:24:05
Protocol discriminator Q.931: 08
Call reference (from originator): 04
RELEASE COMPLETE: 5A
cause: 08 02 80 90
Location: user
Cause: Normal call clearing
(SEND) D3 00:00:41:05
Protocol discriminator Q.931: 08
Call reference (from originator): 05
SETUP: 05
bearer capability: 04 03 80 90 A3
Information transfer capability: speech
Transfer mode: Circuit mode
Information transfer rate: 64 kbit/s
channel identification: 18 01 83
Interface type: basic interface
Preferred/exclusive: preferred
D-channel indicator: not the D-channel
Information channel selection: any channel
calling party number: 6C 0B 00 80 31 30 37 34 30 31 37 35 39
Type of number: unknown
Numbering plan: unknown
Calling party number: 107401759
called party number: 70 0B 80 33 34 37 31 32 33 35 34 34 34
Type of number: unknown
Numbering plan: unknown
Called party number: 3471235444
high layer compatibility: 7D 02 91 81
High layer characteristics identification: telephony
(RECEIVE) D3 00:00:41:07
Protocol discriminator Q.931: 08
Call reference (to originator): 05
SETUP ACKNOWLEDGE: 0D
channel identification: 18 01 89
Interface type: basic interface
Preferred/exclusive: exclusive
D-channel indicator: not the D-channel
Information channel selection: B1 channel
(RECEIVE) D3 00:00:45:01
Protocol discriminator Q.931: 08
Call reference (to originator): 05
CALL PROCEEDING: 02
progress indicator: 1E 02 82 82
Location: public network/local user
Progress description: Destination address is
non-ISDN
(RECEIVE) D3 00:00:45:01
Protocol discriminator Q.931: 08
Call reference (to originator): 05
PROGRESS: 03
progress indicator: 1E 02 82 88
Location: public network/local user
Progress description: In-band information or
appropriate pattern now available
progress indicator: 1E 02 82 82
Location: public network/local user
Progress description: Destination address is
non-ISDN
(RECEIVE) D3 00:01:05:00
Protocol discriminator Q.931: 08
Call reference (to originator): 05
DISCONNECT: 45
cause: 08 02 80 9F
Location: user
Cause: Normal, unspecified
progress indicator: 1E 02 82 88
Location: public network/local user
Progress description: In-band information or
appropriate pattern now available
(SEND) D3 00:01:05:00
Protocol discriminator Q.931: 08
Call reference (from originator): 05
RELEASE: 4D
cause: 08 02 80 90
Location: user
Cause: Normal call clearing
(RECEIVE) D3 00:01:05:01
Protocol discriminator Q.931: 08
Call reference (to originator): 05
RELEASE COMPLETE: 5A
Virgilio Lattanzi
> I'm using asterisk with chan_capi and a Fritz isdn pci card to connect
> to my telcos (Albacom and Telecom Italia).
>
> Almost everything works fine (early B3, etc) but there is a particular
> situation where the communication does not work.
I wouldn't say so. Early B3 is not working if you cannot
hear the free announcement.
> I hope someone can help me fixing this problem otherwise I'll not be
> able to use that card on my system (and I don't know any other cheap
> card for a simple BRI).
It shouldn't be a TA issue. Check that your PBX is sending
a CONNECT_B3_REQ after receiving the info element below:
progress indicator: 1E 02 82 88
Location: public network/local user
Progress description: In-band information or appropriate
pattern now available
Your traces are not CAPI ones so it's impossible to detect
where the problem is. Also try to call numbers like "191"
or "412" that work in a similar way.
Ciao,
--
Virgilio Lattanzi HARPAX srl
Tel: +39 0733 818863 via Fontanella, 38
Fax: +39 0733 819133 62012 Civitanova Marche MC
WWW: www.harpax.com ITALY