Hello. I have the mission of implementing a big SS7 cluster using
chan_ss7. The channel driver itself works in the simplest case -- with
one Asterisk communicating with one switch, I can make and receive calls
just fine. More, I can even communicate with two different switches
(different DPCs) and I can make and receive calls on either one from the
same Asterisk machine -- as long as each of those links has signalling.
Groovy. Now, on to the cluster part.
I has the setup described in the diagram below, and ss7.conf is just
below that. The problem is: the L2 link, from machine 1 to switch sw4,
never comes up -- it always show "reset pending" in "ss7 show channels".
It's not a physical problem, because if I disconnect the cable from L2
and put in L9 in the other machine (and change ss7.conf in myasthost-03
accordingly for a non-cluster configuration), it does come up.
I imagine myasthost-01 was supposed to perform that link's reset by
communicating with myasthost-03 through chan_ss7's cluster protocol. For
some reason it isn't. It isn't a network problem either, I can see in
the logs they "see" each other through port 5040.
Our servers are Dell PowerEdge 1950 with Digium TE410P quad-span cards,
jumpered for E1, running Fedora Core 6, the latest 1.2 series Asterisk,
and chan_ss7 0.9.
+-----------------+ +-----------------+
| myasthost-01 | | myasthost-03 | <-- Asterisk Machines
| L1 L2 L3 L4 | | L9 L10 L11 L12 |
+--+---+---+---+--+ +--+---+---+---+--+
| | |
| | |
| +---------------------+ +---+
| | |
|S | |S
+--+-----------------+ +--+--------+--------+
| CIC 1 | | CIC 1 CIC 129 | <-- Ericsson AXE's
| Switch sw1 | | Switch sw4 |
+--------------------+ +--------------------+
S = Has signalling on timeslot 16
ss7.conf:
----------------------------------------------------------------------
[linkset-sw1]
enabled => yes
enable_st => no
use_connect => yes
hunting_policy => even_mru
subservice => auto
context => ss7
language => da
t35 => 15000,timeout
subservice => auto
[linkset-sw4]
enabled => yes
enable_st => no
use_connect => yes
hunting_policy => even_mru
subservice => auto
context => ss7
language => da
t35 => 15000,timeout
subservice => auto
[link-l1]
linkset => sw1
channels => 1-15,17-31
schannel => 16
firstcic => 1
enabled => yes
[link-l2]
linkset => sw4
channels => 1-31
schannel =>
firstcic => 1
enabled => yes
[link-l10]
linkset => sw4
channels => 1-15,17-31
schannel => 16
firstcic => 129
enabled => yes
[host-myasthost-01]
enabled => yes
default_linkset => sw1
opc => 0x3000
dpc => sw1:0x2001,sw4:0x2004
links => l1:1,l2:2
if-1 => 10.10.10.1
[host-myasthost-03]
enabled => yes
default_linkset => sw4
opc => 0x3fce
dpc => sw1:0x2001,sw4:0x2004
links => l10:2
if-1 => 10.10.10.3
[cluster]
; Listen on TCP port 5040
port => 5040
l1 => myasthost-03#if-1
l2 => myasthost-03#if-1
l10 => myasthost-01#if-1
----------------------------------------------------------------------
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