[asterisk-users] ZapHFC & quadBRI D-Channel going down randomly

[Alberto Pastore]

Hi.

I'm running some asterisk boxes on different sites,
some equipped with a couple of ZapHFC cards, others with
Junghanns quadBRI cards.

All boxes were compiled with Asterisk 1.2.10 (libpri 1.2.3 zaptel 1.2.6)
and bristuff 0.3.0 pre 1s, distribution is Fedora Core 4 with
kernel 2.6.17.3

The cards are connected to Telecom Italia's NT1/NT1+ S/T lines;
some of them are point-to-point, others are point-to-multipoint.

I keep getting always the same problem: after some hours of regular
working, some boxes report the usual message


    Primary D-Channel on span <n> down


(where <n> is different every time, depending on the number of
active bri spans)

I've read on previous postings that having layer 1 down on ptmp
spans is normal.

However after getting a down message (on ptp spans too!) I'm no
more able to place outgoing calls on that span, until
I restart asterisk & zaptel drivers.

Sometimes, they get back working by themselves (with the related
"span up" notification) after a random time period.

During the "down" period, incoming calls are regularly served.
However these calls do not change the status of the span, i.e.
as soon as the calls are hung up, the span gets down again.

I've tried to capture the dialog between the card and NT1 equipment,
and during the "down" state, I got this repeated over and over:


Sending Set Asynchronous Balanced Mode Extended
  [ 00 8b 7f ]
Unnumbered frame:
SAPI: 00  C/R: 0 EA: 0
  TEI: 069        EA: 1
   M3: 3   P/F: 1 M2: 3 11: 3  [ SABME (set asynchronous balanced mode 
extended) ]
   == Primary D-Channel on span 1 down


In zapata.conf I'm pretty sure I've always set the correct signalling 
settings
(switchtype = euroisdn, signalling = bri_cpe_ptmp or bri_cpe depending 
on the case)

In /etc/zaptel.conf, I've tried many combinations with no difference; my 
current
settings are like this:

span=1,1,0,ccs,ami
bchan=1-2
dchan=3

span=2,1,0,ccs,ami
bchan=4-5
dchan=6

etc....


Any clue?

Thanks,
Alberto

--
Alberto Pastore
B-Press Srl - Gruppo MSoft
P.IVA 01697420030
P.le Lombardia, 4 - 28100 Novara - Italy
Tel. 0321-499508 
Fax 0321-492974
http://www.msoft.it