[asterisk-ss7] ss7 newbie

[Matthew Fredrickson]

Christopher (JVM) wrote:
> As a newbie myself I was wondering if someone could tell me the difference 
> between the pointcode the adjacent point code and the defaultdpc. I am 
> trying to obtain these infos from my carrier but he is only giving a single 
> point code.

The adjpointcode is the point code of the entity on the remote end of 
the sigchan you are using.

The defaultdpc is like the default route.  So if your telco has STPs 
between you and the entity that you are supposed to be sending your ISUP 
traffic to (basically an additional hop), you set the defaultdpc to the 
node that your ISUP traffic should go to.  If there are no STPs (or 
additional hops) between you and the point code that you are sending 
your traffic to, you should just set the adjpointcode and the defaultdpc 
to be the same thing.

Matthew Fredrickson

> 
> On Wed, 13 Aug 2008 10:49:26 -0500, Matthew Fredrickson wrote
>> Sriram wrote:
>>> Hi
>>> Thnks for the reply...So say if i want 120 channels over ss7 
>>> signalling...will the telco give me 4 E1s and 1 separate E1 for ss7 
>>> signalling or will the ss7 be in one of the 4 E1s itself..?
>> Sometimes.  It depends on what you negotiate with the telco you're 
>> interconnecting with.  Some of them like to waste an E1 on a single 
>> signalling link though.  And even stupider ones waste a single E1 on 
>> two signalling links.  It seems ridiculous to mandate redundant 
>> signalling links and have them running over the same E1 (Don't ask,
>>  I had somebody come to me having to deal with that).
>>
>> But in any case, you can negotiate with them how you would like to 
>> set it up typically.
>>
>>> Do i have to just plug in those 4 E1s directly into the TE420P and 
>>> install libss7 ? thats it ?
>> Yes :-)  And configure it.
>>
>>> Also please tell me what are the advantages of ss7 over PRI in terms of 
>>> 1.call handling capacity 2. connectivity 3. reliability ..
>> If you need answers to that question, you probably need to research 
>> more into what SS7 is.
>>
>> Typically, you have a more reliable link since you can have 
>> redundant signalling channels.  The protocol also supports a lot 
>> more bearers per signalling link than you can do in PRI (or even 
>> NFAS PRI).
>>
>> Matthew Fredrickson
>> Digium, Inc.
>>
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> 
> 
> --
> Christopher Srinivasa
> VoIP Researcher and Developer / Chercheur et Developpeur VoIP
> christopher at jvminfo.com
> JVM INFORMATIQUE CANADA INC.
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> Brossard, Quebec, Canada J4Y 2P3
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