[asterisk-ss7] Problems setting up cluster with chan_ss7

[Juan Carlos Castro y Castro]

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
----------------------------------------------------------------------