[asterisk-ss7] libss7 - One linkset but 2 DPC with same CICnumber

Tom Chandler tchandle at eastex.net
Wed Dec 12 10:16:37 CST 2007

In an central office, normally there is one link set that signals to a STP. 
There are usually
multiple trunk groups that signal to many dpc's,.  I have been in offices 
that have one
link set, but signal to 20 or 30 different dpc's.  So at least in the US, 
this is very common.

/Tom chandler

----- Original Message ----- 
From: "Matthew Fredrickson" <creslin at digium.com>
To: <asterisk-ss7 at lists.digium.com>
Sent: Wednesday, December 12, 2007 9:29 AM
Subject: Re: [asterisk-ss7] libss7 - One linkset but 2 DPC with same 

> Daniel Bichara wrote:
>> Hi,
>> We are running libss7 with 3 E1s. First E1 has the signalling channel on
>> 16 and the others are connected to two different DPC (different
>> destinations).
>> The point is: CICs of link #2 and #3 are numbered from 1 to 31. They
>> have the same number and function ss7_find_cic() can not find the
>> correct PVT (channel) when looking for CIC number 1, for example, on
>> GRS,GRA,BLO, etc..
>> I am working on a patch to handle OPC information (structure ss7_event /
>> ss7_event_ciconly) and pass this information to ss7_find_cic for such
>> commands.
>> Any comment/suggestion is welcome.
> One additional question I subsequently thought of:  Wouldn't this be an
> invalid scenario though to have in a single linkset?  One of the
> assumptions that I made was that you have one point code associated with
> a linkset/set of signalling channels, not multiple codes associated with
> a single signalling channel.  That sounds almost like an STP type
> configuration...
> I completely understand that you have this problem and are attempting to
> find a good way to solve it.  It's just that I never presumed that such
> a scenario might exist for a non STP box.
> -- 
> Matthew Fredrickson
> Software/Firmware Engineer
> Digium, Inc.
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