[asterisk-ss7] Redundant sigchan, libss7

[Marcus Vinicius]

Hello, 

I'm trying to setup a cenario with 2 sigchan in a linkset. Each sigchan is on an E1 link.

I have 3 E1 links: 

span=1,0,0,ccs,hdb3,crc4
bchan=1-31    # voice only

span=2,0,0,ccs,hdb3,crc4
bchan=32-46,48-62
mtp2=47        # sigchan master

span=3,0,0,ccs,hdb3,crc4
bchan=63-77,79-93
mtp2=78        # sigchan backup


Here is my linkset configuration: 

chan_dahdi.conf

signalling=ss7
ss7type=itu
ss7_called_nai=dynamic
ss7_calling_nai=dynamic
networkindicator=national
linkset=2
pointcode=1
defaultdpc=12
adjpointcode=12

sigchan=47
group=1
cicbeginswith=1
context=from-pstn-01
channel=>1-31


group=2
context=from-pstn-02
cicbeginswith=32
channel=>32-46
cicbeginswith=48
channel=>48-62


sigchan=78
group=3
context=from-pstn-03
cicbeginswith=63
channel=>63-77
cicbeginswith=79
channel=>79-93



When channel 47 is working, 'ss7 show linkset 2' show 'status: Up'. And I can make calls.

But if I disconnect the cable of the span 2, then the states of linkset is 'down'. I can't sincronize with channel 78 (span3). 

Is there any way to have a redundant signal channel? When my sigchan 47 is down, I like to use channel 78 as sigchan.



In the remote side of span3 (asterisk too), I can see the logs below on 'dahdi restart'

[2] Len = 4 [ ff ff 01 00 ]
[2] FSN: 127 FIB 1
[2] BSN: 127 BIB 1
[2] <[1] LSSU SIO
[2]
[2] Link state change: ALIGNEDREADY -> IDLE
[2] Link state change: IDLE -> NOTALIGNED
[2] Len = 4 [ ff ff 01 02 ]
[2] FSN: 127 FIB 1
[2] BSN: 127 BIB 1
[2] <[1] LSSU SIE
[2]
[2] Link state change: NOTALIGNED -> PROVING
[2] T4 expired!
[2] Link state change: PROVING -> ALIGNEDREADY
[2] Len = 3 [ ff ff 00 ]
[2] FSN: 127 FIB 1
[2] BSN: 127 BIB 1
[2] >[1] FISU
[2]
[2] Len = 3 [ ff ff 00 ]
[2] FSN: 127 FIB 1
[2] BSN: 127 BIB 1
[2] <[1] FISU
[2]
[2] Link state change: ALIGNEDREADY -> INSERVICE
MTP2 link up (SLC 1)
[2] Len = 9 [ ff 80 06 80 01 00 03 10 17 ]
[2] FSN: 0 FIB 1
[2] BSN: 127 BIB 1
[2] >[0] MSU
[2] [ ff 80 06 ]
[2]     Network Indicator: 2 Priority: 0 User Part: NET_MNG (0)
[2]     [ 80 ]
[2]     OPC 12 DPC 1 SLS 1
[2]     [ 01 00 03 10 ]
[2]     H0: 7 H1: 1
[2]     Message type: TRA
[2]     [ 17 ]
[2]
[2] Len = 20 [ ff 81 11 81 01 00 03 10 11 a0 32 35 36 34 32 38 36 32 38 38 ]
[2] FSN: 1 FIB 1
[2] BSN: 127 BIB 1
[2] >[0] MSU
[2] [ ff 81 11 ]
[2]     Network Indicator: 2 Priority: 0 User Part: STD_TEST (1)
[2]     [ 81 ]
[2]     OPC 12 DPC 1 SLS 1
[2]     [ 01 00 03 10 ]
[2]     H0: 1 H1: 1
[2]     [ 11 ]
[2]
[2] Len = 4 [ ff ff 01 00 ]
[2] FSN: 127 FIB 1
[2] BSN: 127 BIB 1
[2] >[0] LSSU SIO
[2]


I will appreciate any help or sugestions.


thanks a lot.


--
Marcus 
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