[asterisk-ss7] chan_ss7 block CIC's

Mon Feb 26 08:19:40 MST 2007

Hi Kristian,

Kristian Nielsen schrieb:
> asterisk at nicox.org writes:
>
>   
>> I have blocked some CIC's with ss7 block 6 15
>> and if i check the status with ss7 linestat  i see that the CIC's are
>> blocked, BUT Asterisk initiates new calls to this CIC's
>>
>> Did anybody else see this before?
>>     
>
> In SS7/ISUP, the blocking of a CIC is a one-way thing.
>
>   
That is wrong. Local blocking is for maintain cic´s or something and all
blocking messages require an ACK message from exchange. After CGB the
exchange shoudnt signalling any inbound to the blocked cic´s. Read about
here:
http://www.asknumbers.com/SS7ISUPMessages.aspx

We have chan_ss7  with 4 spans and recovered an other blocking bug. We
block one cic on span 1 e.g cic 19 with the command:
ss7 block 19 1
we got on the cli:
ss7 block 19 1
Sending Blocking message to peer
Sending Blocking message to peer
Sending Blocking message to peer
Sending Blocking message to peer
[Feb 26 16:15:21] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=19,
mask=0x00000001.
[Feb 26 16:15:21] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=51,
mask=0x00000001.
[Feb 26 16:15:21] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=83,
mask=0x00000001.
[Feb 26 16:15:21] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=115,
mask=0x00000001.
[Feb 26 16:15:21] NOTICE[29691]: l4isup.c:3134 process_cga: Process CGA,
cic=19, range=32
[Feb 26 16:15:21] NOTICE[29691]: l4isup.c:3134 process_cga: Process CGA,
cic=51, range=32
[Feb 26 16:15:21] NOTICE[29691]: l4isup.c:3134 process_cga: Process CGA,
cic=83, range=32
[Feb 26 16:15:21] NOTICE[29691]: l4isup.c:3134 process_cga: Process CGA,
cic=115, range=32

we got an ACK for cic 19 on all 4 spans :-)

Thats not okay because all channels have ascending cic numbers:
voip-dus-06*CLI> ss7 show channels
Linkset: vstCLI>
CIC   1 Busy
CIC   2 Idle
CIC   3 Idle
CIC   4 Busy
CIC   5 Idle
CIC   6 Busy
CIC   7 Idle
CIC   8 Busy
CIC   9 Idle
CIC  10 Busy
CIC  11 Idle
CIC  12 Busy
CIC  13 Idle
CIC  14 Busy
CIC  15 Busy
CIC  17 Busy
CIC  18 Busy
CIC  19 Idle             BLOCKED Local Maintenance
CIC  20 Busy
CIC  21 Busy
CIC  22 Busy
CIC  23 Busy
CIC  24 Busy
CIC  25 Busy
CIC  26 Busy
CIC  27 Busy
CIC  28 Idle
CIC  29 Idle
CIC  30 Initiating call
CIC  31 Idle
CIC  33 Busy
CIC  34 Busy
CIC  35 Idle
CIC  36 Idle
CIC  37 Idle
CIC  38 Busy
CIC  39 Busy
CIC  40 Initiating call
CIC  41 Idle
CIC  42 Busy
CIC  43 Busy
CIC  44 Idle
CIC  45 Idle
CIC  46 Busy
CIC  47 Idle
CIC  48 Busy
CIC  49 Idle
CIC  50 Busy
CIC  51 Busy             BLOCKED Local Maintenance
CIC  52 Busy
CIC  53 Idle
CIC  54 Busy
CIC  55 Idle
CIC  56 Busy
CIC  57 Idle
CIC  58 Busy
CIC  59 Busy
CIC  60 Idle
CIC  61 Busy
CIC  62 Idle
CIC  63 Idle
CIC  65 Idle
CIC  66 Busy
CIC  67 Idle
CIC  68 Initiating call
CIC  69 Idle
CIC  70 Busy
CIC  71 Idle
CIC  72 Busy
CIC  73 Idle
CIC  74 Busy
CIC  75 Busy
CIC  76 Busy
CIC  77 Idle
CIC  78 Initiating call
CIC  79 Busy
CIC  80 Busy
CIC  81 Busy
CIC  82 Busy
CIC  83 Busy             BLOCKED Local Maintenance
CIC  84 Idle
CIC  85 Idle
CIC  86 Initiating call
CIC  87 Idle
CIC  88 Busy
CIC  89 Idle
CIC  90 Busy
CIC  91 Busy
CIC  92 Busy
CIC  93 Idle
CIC  94 Busy
CIC  95 Idle
CIC  97 Idle
CIC  98 Initiating call
CIC  99 Idle
CIC 100 Busy
CIC 101 Busy
CIC 102 Busy
CIC 103 Idle
CIC 104 Busy
CIC 105 Idle
CIC 106 Busy
CIC 107 Idle
CIC 108 Busy
CIC 109 Busy
CIC 110 Busy
CIC 111 Idle
CIC 112 Idle
CIC 113 Idle
CIC 114 Idle
CIC 115 Idle             BLOCKED Local Maintenance
CIC 116 Busy
CIC 117 Idle
CIC 118 Busy
CIC 119 Busy
CIC 120 Idle
CIC 121 Busy
CIC 122 Idle
CIC 123 Idle
CIC 124 Busy
CIC 125 Idle
CIC 126 Busy
CIC 127 Idle

We think that is a bug definitely.

The good thing is that an unblock do the same :-)
ss7 unblock 19 1
Sending Unblocking message to peer
Sending Unblocking message to peer
Sending Unblocking message to peer
Sending Unblocking message to peer
[Feb 26 16:17:42] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP UNBLOCKING,
cic=19, mask=0x00000001.
[Feb 26 16:17:42] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP UNBLOCKING,
cic=51, mask=0x00000001.
[Feb 26 16:17:42] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP UNBLOCKING,
cic=83, mask=0x00000001.
[Feb 26 16:17:42] NOTICE[20656]: l4isup.c:3619
do_group_circuit_block_unblock: Sending CIRCUIT GROUP UNBLOCKING,
cic=115, mask=0x00000001.
[Feb 26 16:17:42] NOTICE[29691]: l4isup.c:3189 process_cua: Process CUA,
cic=19, range=32
[Feb 26 16:17:42] NOTICE[29691]: l4isup.c:3189 process_cua: Process CUA,
cic=51, range=32
[Feb 26 16:17:42] NOTICE[29691]: l4isup.c:3189 process_cua: Process CUA,
cic=83, range=32
[Feb 26 16:17:42] NOTICE[29691]: l4isup.c:3189 process_cua: Process CUA,
cic=115, range=32

Greets

Udo

> So if exchange A does a local blocking of CIC 6, that means that a remote
> exchange B at the other end of CIC 6 will no longer initiate incoming calls on
> CIC 6. But it does not prevent in any way exchange A from initiating a call on
> CIC 6 towards exchange B.
>
> I do not know/remember the details of blocking in chan_ss7, but I suspect that
> the above is the reason that local calls still take place on locally blocked
> circuits. If so, it should be fairly simple to add something to the code that
> marks blocked curcuits busy in some way, so that the channel allocation will
> skip them.
>
> Hope this helps,
>
>  - Kristian.
>
>   

-- 
Für weitere Fragen stehe ich Ihnen selbstverständlich zur Verfügung und verbleibe bis dahin,

mit freundlichen Grüßen

____________________________________________________
Udo Dluzinski | CTO

dus.net GmbH

Hauptsitz
Straelener Weg 83
D-40472 Düsseldorf

NL Connecta Park
In der Steele 29
D-40599 Düsseldorf

T: +49 (0)211 2370 41-47
F: +49 (0)211 2370 41-44 oder 45
E: dlu at dus.net
W: http://dus.net

HRB: 51060
AG: Düseldorf
GF: Andree Meier, Udo Dluzinski