[asterisk-ss7] CRC errors on SS7 D110P OpenVox Card

Tue Oct 2 19:25:04 CDT 2007

Dear All,

I am testing one of your E1 cards "D110P" with chan_ss7. When I
connected 2 cards back to back they worked perfectly and I forwarded
some calls from one asterisk box to the other.

When I connected them to our ss7 provider. I get some errors in asterisk
logs.

Here is sample of these errors:

Jul 19 13:04:13 NOTICE[3267] mtp.c: MTP changeover last_ack=4,
last_sent=4, from schannel 1, no INSERVICE schannel found
Jul 19 13:04:13 NOTICE[3267] mtp.c: Failover not possible, no other
signalling link and no other host available.
Jul 19 13:04:13 NOTICE[3267] mtp.c: Excessive poll delay 4943!
Jul 19 13:04:13 NOTICE[3267] mtp.c: Full Zaptel input buffer detected,
incoming packets may have been lost on link '|1'.
Jul 19 13:04:13 NOTICE[3267] mtp.c: Empty Zaptel output buffer detected,
outgoing packets may have been lost on link '|1'.
Jul 19 13:04:13 NOTICE[3267] mtp.c: MTP2 CRC error (CRC=0xf863 !=
0xf0b8) on link '|1'.
Jul 19 13:04:13 DEBUG[3267] mtp.c: Last raw bits on link '|1': 1c 18 0c
0e 9d 67 e2 1c 18 0c 0e 9d 67 e2 1c 18 0c 0e 9d 67 e2 1c 18 0c 0e 9d 67
e2 1c 18 0c 0e 67 e2 1c 18
Jul 19 13:04:13 NOTICE[3267] mtp.c: Got event on link '|1': 5 (0/11).
Jul 19 13:04:13 NOTICE[3267] mtp.c: Got event on link '|1': 4 (0/11).
Jul 19 13:04:13 NOTICE[3267] mtp.c: Got event on link '|1': 5 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 4 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 5 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 4 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 5 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 4 (0/11).
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 5 (0/11).
Jul 19 13:04:14 DEBUG[3267] mtp.c: Restarting initial alignment on link
'|1'.
Jul 19 13:04:14 NOTICE[3267] mtp.c: Got event on link '|1': 4 (0/11).
Jul 19 13:04:15 DEBUG[3267] mtp.c: MTP2 bitstream frame format error,
entering octet counting mode on link '|1'.
Jul 19 13:04:15 DEBUG[3267] mtp.c: Last raw bits on link '|1': d8 0c 03
d2 b7 ef be fb 01 80 7a 56 fd f7 df 60 30 0f 4a df be fb ec 06 01 e9 5b
f7 df 7d 80 c0 ff ff ff ff
Jul 19 13:04:16 DEBUG[3267] mtp.c: Restarting initial alignment on link
'|1'.

When I added crc4 to the zaptel configuration the ISUP and MTP messages
stopped on the link and no log entries

I am not sure about the E1 / T1 Jumper. I do not have easy physical
access to the server so I used the following command to override the
jumper settings

insmod  /lib/modules/2.6.9-34.0.2.EL/extra/wcte11xp.ko t1e1override=15

Do I have to change it physically to avoid any confusion ?

I have attached a pcap capture of the traffic on the wire.

I am currently using chan_ss7.  Should I test with libss7 the native ss7
implementation ? 

Here is my zaptel config:

span=1,1,0,ccs,hdb3
bchan=1-31 

# Span 1: WCT1/0 "Digium Wildcard TE110P T1/E1 Card 0" 
# channel 1, WCT1, unhandled for now
# channel 2, WCT1, unhandled for now
# channel 3, WCT1, unhandled for now
# channel 4, WCT1, unhandled for now
# channel 5, WCT1, unhandled for now
# channel 6, WCT1, unhandled for now
# channel 7, WCT1, unhandled for now
# channel 8, WCT1, unhandled for now
# channel 9, WCT1, unhandled for now
# channel 10, WCT1, unhandled for now
# channel 11, WCT1, unhandled for now
# channel 12, WCT1, unhandled for now
# channel 13, WCT1, unhandled for now
# channel 14, WCT1, unhandled for now
# channel 15, WCT1, unhandled for now
# channel 16, WCT1, unhandled for now
# channel 17, WCT1, unhandled for now
# channel 18, WCT1, unhandled for now
# channel 19, WCT1, unhandled for now
# channel 20, WCT1, unhandled for now
# channel 21, WCT1, unhandled for now
# channel 22, WCT1, unhandled for now
# channel 23, WCT1, unhandled for now
# channel 24, WCT1, unhandled for now
# channel 25, WCT1, unhandled for now
# channel 26, WCT1, unhandled for now
# channel 27, WCT1, unhandled for now
# channel 28, WCT1, unhandled for now
# channel 29, WCT1, unhandled for now
# channel 30, WCT1, unhandled for now
# channel 31, WCT1, unhandled for now

Here is my ss7.conf:

[linkset-siuc]

enabled => yes
enable_st => no
use_connect => yes
hunting_policy => even_mru
context => ss7
language => en
subservice => auto

[link-|1]
linkset => siuc
channels => 2-31
schannel => 1
firstcic => 2
enabled => yes

[host-asterisk2.local]
enabled => yes
opc => 0x43d
dpc => siuc:0x854
links => |1:1

Any Help will be appreciated

=====================================

Mostafa Ibrahim 
Security Department Manager
ValueSyS
website: http://www.valuesys.net 
Tel:         +202 22682552 +202 2682887
Fax:         +202 22674346
Mobile:    +2 0181008194
Email: mostafa.ibrahim at valuesys.net
======================================
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