[asterisk-ss7] Asterisk - LibSS7 - Redundency or Failover configuration.

[Kaloyan Kovachev]

libss7 does support multiple point codes and there is nothing special or 
wrong with such configuration, but ...

When using Dial(DAHDI/g1/${EXTEN}):
If your linkset 1 is down, the calls go to the second linkset in your 
group 1 - this is what you observe
If you have more than 60 calls they will still go to the second linkset 
- it is not just for backup, but also extending your available channels, 
which is similar to have just one linkset with 4 E1
If only one of the E1 in linkset 1 is down the other will be used for 30 
calls and the next call will go to linkset 2

If you use Dial(DAHDI/G1/${EXTEN}) it will start from the last CIC of 
second E1 from linkset 2 and similarly with 'r' or 'R' it will cycle 
through all CICs from both linksets


On 2015-04-04 12:48, GOPI GANAPATHY wrote:
> Dear all,
> 
> I'm experimenting with libss7 and asterisk to do a fail-over
> configuration. I've 2 Asterisk Boxes, connected back-to-back with 4
> E1s.
> 
> 2 E1s are configured as linkset - 1 with 2 links in it. Other 2E1s are
> configured as linkset - 2 with 2 links in it. Both linkset has
> different OPC and DPC. Please see the below for the configuration.
> 
> Asterisk - A:
> 
> 
> group=1
> context=from-internal
> signalling=ss7            ;this is ss7 signalling
> ss7type=itu              ;using the ITU variant
> ss7_called_nai=dynamic            ;NAI for outgoing calls
> ss7_calling_nai=dynamic           ;NAI for incoming calls
> ss7_internationalprefix=00 ;internation prefix value for incoming calls
> ss7_nationalprefix=0           ;national prefix value for incoming 
> calls
> ss7_subscriberprefix=           ;subscriber prefix value for incoming 
> calls
> ss7_unknownprefix=               ;unknown prefix value for incoming 
> calls
> ss7_explictacm=yes             ;ACM is send as soon as call enters the
> dialplan...may not accepted yet though
> 
> linkset=1             ;arbitary name for this set of channels
> pointcode=1               ;the point code for this system...aka SPC
> adjpointcode=2               ;the point code for the system that we
> are signalling to... aka APC
> defaultdpc=2               ;the point code for the system that the
> CICs will be negoiated with...aka DPC
> networkindicator=international ;NI value for MTP3
> cicbeginswith=1              ;the starting value of the CICs
> channel=>1-15
> cicbeginswith=17
> channel=>17-31
> cicbeginswith=32
> channel =>32-46
> cicbeginswith=48
> channel=>48-62
> slc=0
> sigchan=16
> slc=1
> sigchan=47               ;the signalling channel
> 
> linkset=2             ;arbitary name for this set of channels
> pointcode=3               ;the point code for this system...aka SPC
> adjpointcode=4               ;the point code for the system that we
> are signalling to... aka APC
> defaultdpc=4               ;the point code for the system that the
> CICs will be negoiated with...aka DPC
> networkindicator=international ;NI value for MTP3
> cicbeginswith=63              ;the starting value of the CICs
> channel =>63-77
> cicbeginswith=79
> channel =>79-93
> cicbeginswith=94
> channel =>94-108
> cicbeginswith=110
> channel=>110-124
> slc=0
> sigchan=78
> slc=1
> sigchan=109              ;the signalling channel
> 
> 
> Asterisk - B
> 
> group=1
> context=from-internal
> signalling=ss7            ;this is ss7 signalling
> ss7type=itu              ;using the ITU variant
> ss7_called_nai=dynamic            ;NAI for outgoing calls
> ss7_calling_nai=dynamic           ;NAI for incoming calls
> ss7_internationalprefix=00 ;internation prefix value for incoming calls
> ss7_nationalprefix=0           ;national prefix value for incoming 
> calls
> ss7_subscriberprefix=           ;subscriber prefix value for incoming 
> calls
> ss7_unknownprefix=               ;unknown prefix value for incoming 
> calls
> ss7_explictacm=yes             ;ACM is send as soon as call enters the
> dialplan...may not accepted yet though
> 
> linkset=1             ;arbitary name for this set of channels
> pointcode=2                ;the point code for this system...aka SPC
> adjpointcode=1               ;the point code for the system that we
> are signalling to... aka APC
> defaultdpc=1               ;the point code for the system that the
> CICs will be negoiated with...aka DPC
> networkindicator=international ;NI value for MTP3
> cicbeginswith=1              ;the starting value of the CICs
> channel=>1-15
> cicbeginswith=17             ;the starting value of the CICs
> channel=>17-31
> cicbeginswith=32
> channel=>32-46
> cicbeginswith=48
> channel=>48-62
> slc=0
> sigchan=16
> slc=1
> sigchan=47              ;the signalling channel
> 
> linkset=2             ;arbitary name for this set of channels
> pointcode=4               ;the point code for this system...aka SPC
> adjpointcode=3               ;the point code for the system that we
> are signalling to... aka APC
> defaultdpc=3               ;the point code for the system that the
> CICs will be negoiated with...aka DPC
> networkindicator=international ;NI value for MTP3
> cicbeginswith=63              ;the starting value of the CICs
> channel =>63-77
> cicbeginswith=79
> channel=>79-93
> cicbeginswith=94
> channel=>94-108
> cicbeginswith=110
> channel=>110-124
> slc=0
> sigchan=78
> slc=1
> sigchan=109
> 
> When everything is normal and I make a call, the call go through via
> the linkset 1. Then I removed the Physical cable of 1st and 2nd E1,
> now the call goes via linkset 2. So I assume that it works as
> expected. My doubt is I've read post in this mailing-list saying
> Libss7 cannot support multiple point code or you need special
> configurations with multiple asterisk running etc... But it looks like
> it has worked for me, or am I missing something ??? Please en-light...