[asterisk-ss7] Asterisk like a SS7 STP

[Michael Mueller]

STPs in ITU-land are awkward since ITU voice networks are a mesh of E1 with
signaling in the same bundles as the voice

in ANSI-land, the STP was incorporated and mandated by two large and
powerful monopolies: BC and ATT; signaling became de-coupled from the voice
and traveling in a separate network connected by hierarchy of mated pair
STPs

putting an STP or an STP-like invention in an typical ITU network raises
questions about commercial viability: having a central STP might raise your
E1 charges because they travel over longer distances - this raises monthly
charges in many places; might be cheaper to connect locally - but then you
have increased monthly charges for colo space

there is conceptual dissonance between STPs and ITU networks - STPs require
the signaling be separate from the voice, and ITU mesh networks are built
around signaling and voice channels traveling in the same bundles of wire
(i've just restated my first 2 paragraphs); decoupling signaling means
using an entire E1 for a single signal channel; this usually causes despair
to the typical ITU ss7 engineer but is business as usual to the ANSI
counterpart

the cheapest STP I know of is the PT Segway; maybe you can get a Tekelec
Eagle; I'm not aware of any Linux based DIY STPs; ss7box started as an STP
but evolved away from the function as there was little need for a low-end
STP in ANSI-land and zero need for it in ITU-land

ss7box supports Asterisk box clustering around a single point code with CIC
routing; clustering might be something you want to investigate - you'd have
to examine the technical, commercial, and incumbent connection policies to
see if it would help you build an IP voice network with fewer connections
to the incumbent telco network using such a clustering function

you asked a complicated question, or I've turned a simple question into a
complicated one - both are plausible

On Thu, Mar 15, 2012 at 11:45 AM, Rodrigo Ricardo Passos <
rodrigopassos at gmail.com> wrote:

>  Michael,
>
> Can you explain more?
> Here, in Brazil, the standard is ITU. I think it isn´t possible because
> ITU is used in all telcos.
>
>
> Em 15/03/2012 12:25, Michael Mueller escreveu:
>
> connecting a mated pair of STPs to an ANSI network as a peer has more
> requirements than connecting an SSP; ITU STP are less common so connection
> requirements might be more variable
>
> On Thu, Mar 15, 2012 at 10:19 AM, Rodrigo Ricardo Passos <
> rodrigopassos at gmail.com> wrote:
>
>>  Gustavo,
>>
>> Do you know Yate? Knows if Yate can be used in place of asterisk?
>> I know that this list is about Asterisk SS7, but I think that this
>> question doesn´t bad.
>>
>> Regards,
>>
>> Rodrigo
>>
>> Em 14/03/2012 16:55, Gustavo Mársico escreveu:
>>
>> There is no pure STP implementation on libss7 or chan_ss7. Modules cannot
>> send TFA, TFP, support STP timers, etc. Today, all you can do is routing
>> based in the extensions, but that's not STP function.
>> However, I know that some efforts were made on libss7 and the last time I
>> checked looked promising. I'll try to find what's going on there.
>>
>>  Regards
>>
>>  Gustavo
>>
>>
>>  On Mar 14, 2012, at 4:39 PM, Rodrigo Ricardo Passos wrote:
>>
>>  Hi all,
>>
>> I have a question of how can I create STPs Boxes with Asterisk in my
>> network?
>>
>> My project includes a creation of network with asterisk SPs and STPs and
>> my initial idea is a implementation of these boxes using TDMoE. So, create
>> two boxes like STP e another’s boxes like SP.
>>
>> All signalization will pass to both STPs. Anyone knows if my scenario
>> will be one scenario with a real STP boxes or this will never STP ambient?
>>
>> Other question is, if this last question is false, how can I create this
>> ambient with asterisk?
>>
>>
>> Best Regards,
>>
>> Rodrigo
>>
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