[asterisk-ss7] "SS7 requester: No idle circuit available."after2 days of load

[Antoine Megalla]

On Mon, Nov 12, 2007 at 10:45:32AM -0800, Antoine
Megalla wrote:
>
>=> ss7 show channels say:
>=> Linkset: MSC2
>=> CIC   1 Busy
>[...]
>=> CIC  10 Idle
>[...]
>=> CIC  33 Idle             BLOCKED Remote Hardware
>[...]
>=> CIC  63 Idle             BLOCKED Remote Hardware
>
>And your ss7.conf looks like...?

The second E1 is blocked from the operator side, this
is not an error in the
link, I have plugged both E1s in a running SS7 switch,
and they exhibited
the exact same behavior: that is the first E1 is up
and the second E1 is
blocked from the operator side.
Here is the ss7.conf file:

[linkset-MSC2]
enabled => yes
enable_st => no
use_connect => no
hunting_policy => seq_lth
subservice => auto
context => ss7
language => en
t35 => 15000,timeout


[link-l1]
linkset => MSC2
channels => 1-15,17-31
schannel => 16
firstcic => 1
echocancel=allways
echocan_taps=32
echocan_train=350
enabled => yes

[link-l2]
linkset => MSC2
channels => 1-15,17-31
schannel =>
firstcic => 33
echocancel=allways
echocan_taps=32
enabled => yes

[host-SS7]
enabled => yes
default_linkset => MSC2
opc => 465
dpc => MSC2:614
links => l1:1,l2:2

if-1 => 192.168.0.131


However I discovered something interresting from the
logs; that the SS7 link
goes down just before the problem occurs:
And it appears that the there is an improper handling
of the case when the
link goes down, causing some channels to hang in an
unknown state while the
command "ss7 show channels" shows these channels as
idle.
The problem is that I cannot identify the reason the
SS7 link goes down, is
it the operator side, or a problem with chan_ss7 that
causes the link to go
down.


snippet:

Nov 12 04:20:43 NOTICE[3868] mtp.c: Got status
indication 'OS' while
INSERVICE.
Nov 12 04:20:43 WARNING[3868] chan_ss7.c: MTP is now
DOWN on link 'l1'.
Nov 12 04:20:43 NOTICE[3868] mtp.c: MTP changeover
last_ack=114,
last_sent=114, from schannel 16, no INSERVICE schannel
found
Nov 12 04:20:43 NOTICE[3868] mtp.c: Failover not
possible, no other
signalling link and no other host available.
Nov 12 04:20:44 WARNING[19210] l4isup.c: No idle
circuit found.
Nov 12 04:20:44 WARNING[19210] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:44 NOTICE[19210] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:44 WARNING[3868] mtp.c: No signalling
links inservice and no
cluster receivers alive, dropping packet!
Nov 12 04:20:45 WARNING[3868] mtp.c: No signalling
links inservice and no
cluster receivers alive, dropping packet!
Nov 12 04:20:45 WARNING[3868] mtp.c: No signalling
links inservice and no
cluster receivers alive, dropping packet!
Nov 12 04:20:46 WARNING[3868] chan_ss7.c: MTP is now
UP on link 'l1'.
Nov 12 04:20:46 WARNING[3868] chan_ss7.c: MTP is now
INSERVICE for linkset
'MSC2'.
Nov 12 04:20:46 WARNING[19219] l4isup.c: No idle
circuit found.
Nov 12 04:20:46 WARNING[19219] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:46 NOTICE[19219] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:47 NOTICE[3868] l4isup.c: Got ANM
message, but no ACM, on
CIC=22?!?
Nov 12 04:20:47 NOTICE[19228] l4isup.c:
isup_called_party_num_encode
returned 'xxxxxx53271' in phonenumber.
Nov 12 04:20:47 NOTICE[19228] l4isup.c:
isup_calling_party_num_encode
phonenumber '00' .
Nov 12 04:20:47 NOTICE[19228] l4isup.c: Intrenational
format for phonenumber
00.
Nov 12 04:20:47 NOTICE[19228] l4isup.c:
isup_calling_party_num_encode
returned '' phonenumber , '1' is_international .
Nov 12 04:20:48 NOTICE[3868] l4isup.c: Got ANM
message, but no ACM, on
CIC=21?!?
Nov 12 04:20:49 NOTICE[19232] l4isup.c:
isup_called_party_num_encode
returned 'xxxxxx24911' in phonenumber.
Nov 12 04:20:49 NOTICE[19232] l4isup.c:
isup_calling_party_num_encode
phonenumber '00' .
Nov 12 04:20:49 NOTICE[19232] l4isup.c:
isup_calling_party_num_encode
returned '' phonenumber , '1' is_international .
Nov 12 04:20:50 WARNING[19234] l4isup.c: No idle
circuit found.
Nov 12 04:20:50 WARNING[19234] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:50 NOTICE[19234] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:50 WARNING[19237] l4isup.c: No idle
circuit found.
Nov 12 04:20:50 WARNING[19237] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:50 NOTICE[19237] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:51 WARNING[19241] l4isup.c: No idle
circuit found.
Nov 12 04:20:51 WARNING[19241] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:51 NOTICE[19241] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:52 NOTICE[3868] l4isup.c: Got ANM
message, but no ACM, on
CIC=25?!?
Nov 12 04:20:53 WARNING[19244] l4isup.c: No idle
circuit found.
Nov 12 04:20:53 WARNING[19244] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:53 NOTICE[19244] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)
Nov 12 04:20:54 WARNING[19247] l4isup.c: No idle
circuit found.
Nov 12 04:20:54 WARNING[19247] l4isup.c: SS7
requester: No idle circuit
available.
Nov 12 04:20:54 NOTICE[19247] app_dial.c: Unable to
create channel of type
'SS7' (cause 34 - Circuit/channel congestion)




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