[Asterisk-biz] E1 with SS7 signaling

[Francisco A. Lozano]

I don't fully understand the full SS7 "world", but one think I'm sure 
about is that if you're going to be part of a SS7 signaling network, you 
should learn a little about it, it needs much deeper knowledge than 
having a pair of E1s with EuroISDN. Take a look at "Signaling System 
#7", by Travis Rusell.

Christian Savinovich escribió:

> Francisco:
>
>  Can you help me understand this :) ?.
>
>  I am used to think one port with 24/30 channels, maybe one port doing signaling (E1).   That's the way the Digium port will work.   How does that differs from the SS7 port level, are they receiving the same number of channels? Is it like channel 16 (on an E1) sends the messaging to an out of band channel on the SS7 port, and if so, what channel is that? if there are 30 channels on the digium port, will the SS7 port handle 30 conversations?
>I keep thinking one Digium port to one SS7 port, since that's all I need.  And finally, are all SS7 ports compatible?, or are there "implementations"?, if so, how the heck am I going to know if what I am paying for will work?
>
> Thanks a lot
>
>
>On Jun 12, 2005, at 3:51 AM, Francisco A. Lozano wrote:
>
>At 09:21 AM 6/12/2005, you wrote:
>(Please correct me if I'm wrong)
>
>SS7 is a complex stack involving many layers (MTP 1-3, SCCP,TCAP, ISUP).
>I think you're talking about SSP and SCP.In SS7, one or more channels in one or more E1s transport the signaling between a SSP(Service Switching Point) and a SCP (Service Control Point). With only one channel between an SCP and a SSP, an SCP can signal a huge amount of calls to the SSP.
>
>What people usually talks about when talking about SS7 is ISUP, which is somewhat like "EuroISDN". Then, when people here talks about "sending calls over SS7", they really mean "sending calls over ISUP".
>
>Brian West escribió:
>
>It is my understanding that you DO NOT send calls over SS7 you only  
>signal with it.. and a few channels on an E1 can signal many calls a  
>second.
>
>/b
>---
>Anakin: “You’re either with me, or you’re my enemy.”
>Obi-Wan: “Only a Sith could be an absolutist.”
>
>On Jun 12, 2005, at 3:51 AM, Francisco A. Lozano wrote:
>
>Maybe with 24 E1s you can afford a small SSP ... SS7 licenses for  
>asterisk are quite expensive!
>
>Michael Welter escribió:
>
>
>The Honduras telephone company, Hondutel, will supply E1 circuits  
>with SS7 signaling only (no PRI, no R2, nothing but SS7).  The SS7  
>is on a separate circuit (I assume V.35).
>
>We would like to interface Hondutel with one or more Asterisk  
>systems--we want Asterisk to be the bridge between Hondutel and  
>VoIP services.  Initially we'll have one E1 for a proof of concept  
>trial.  If successful the project will immediately grow to ~24 E1  
>circuits.
>
>The problem is finding an inexpensive interface with the E1/SS7  
>circuit that will interoperate with Hondutel.
>
>Does anyone have any suggestions?
>
>Thanks,
>
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