Re: [asterisk-users] Question about SS7
On Wed, 14 May 2008 17:06:54 -0400, Alexander Lopez wrote: > SS7 helps carriers maximize the use of the circuits that interconnect > them with others. Instead of using a channel and having it open for 30 > seconds as the call is setup, user gets signaling (busy, ringing, not in > service), and call is torn down. It can get the result in a split > second with out using any of my channels, all out of band and digital > rather than analog, (see 2600 signaling) simplistically, ss7 is like sip which sets up the call, and the circuit itself is the rtp streams which are then built when the call is connected. likewise, you can have the sip exchange go through one path/route and rtp through another. -- Regards, /\_/\ "All dogs go to heaven." [EMAIL PROTECTED](0 0) http://www.openmalaysiablog.com/ +==oOO--(_)--OOo==+ | for a in past present future; do| | for b in clients employers associates relatives neighbours pets; do | | echo "The opinions here in no way reflect the opinions of my $a $b." | | done; done | +=+ ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
SS7 was a replacement for the in-band signaling that was used in the PSTN (as my 13 y/o would say... Back in the Day). It allows for call information to be exchanged without the use of a circuit being built from switch to switch. For example: Without SS7. You place a call from NYC to LA. The NYC Switch would request a Long Distance trunk, that trunk would them be built (literally) from NYC to LA. Then the LA switch would dial your Aunt in LA, and ring her phone. This would require time and resources to do and you wouldn't know if the line was busy until the switch in LA told you so. With SS7 A packet of information is send on the SS7 network. Comprising but not limited to, BTN/ANI*, Destination number, etc... The network responds if the other side is busy, out of service, available, etc. The two sides then negotiate how the call will be routed and the call is then setup. This is WAY oversimplified but it has the bulk of the ideas. How does SS7 help me and when would I have to use it. SS7 helps carriers maximize the use of the circuits that interconnect them with others. Instead of using a channel and having it open for 30 seconds as the call is setup, user gets signaling (busy, ringing, not in service), and call is torn down. It can get the result in a split second with out using any of my channels, all out of band and digital rather than analog, (see 2600 signaling) Most would never need to interface, or even know, what SS7 is and what is does. The SS7 network is the traffic control system, where as the calls are the buses, cars, and trucks that use the 'streets' of the PSTN. When you stop at a red light, you may not realize that it my be synchronized with all the street lights in the area and that they are controlled from a central point, YOU just stop on red, go on green, and go faster on Yellow!!! If you want to know more about SS7 I would start be Gogooleing for Phone Phreaking, Blue Boxing, Capt. Crunch. This was the dominant BUSINESS reason for pushing through the adoption of SS7 as a replacement for SS5 Look at the Wikipedia under SS5 and SS7 for a better understanding http://en.wikipedia.org/wiki/Signaling_System_5 http://en.wikipedia.org/wiki/Signaling_System_7 Alex *See other thread about this one!!! From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of mark morreny Sent: Wednesday, May 14, 2008 4:22 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Question about SS7 Hi Mik Could you elaborate on what you mean by " SS7 allows you to receive large amounts of data, allows you to grow your network over 100 T1's, etc."? Why is SS7 a compusory requirement for a large network instead of "all" network? I have read quite a bit about SS7 from Google and the part that is not discussed about is the relationship of SS7 with VOIP. When is SS7 needed in VOIP and what kind of benefits SS7 can deliver and how? Thanks alot for your info. Regards, Mark ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
On Wed, May 14, 2008 at 04:37:06PM -0400, Alex Balashov wrote: > SS7 is an out-of-band signaling system is used inside telcos for > trunking between network elements -- mainly softswitches or traditional > big-iron TDM switches (such as the Lucent 5E, Nortel DMS, etc.) -- and > to provide certain database access features used by that type of > equipment and service provider, such as LNP (Local Number Portability > information), CNAM (directory listings), certain billing processes, etc. > SS7 operates on a carrier level and at global dimensions. Listen when Alex talks. He clearly knows whereof. Cheers, -- jra -- Jay R. Ashworth Baylink [EMAIL PROTECTED] Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com '87 e24 St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274 Those who cast the vote decide nothing. Those who count the vote decide everything. -- (Joseph Stalin) ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
How VOIP relates to SS7 is fairly simple; you aren't going to connect to an SS7 network with VOIP unless you have some kind of bridge between the two. As for what SS7 is able to send in terms of data, there is a huge list. This includes data sent before a channel is aquired, data sent during, as well as after a call is placed. In all, what others have said is true; you only need to worry about SS7 if you're required to. mark morreny wrote: > Hi Mik > > Could you elaborate on what you mean by " SS7 allows you to receive > large amounts of data, allows you to grow your > network over 100 T1's, etc."? Why is SS7 a compusory requirement for a > large network instead of "all" network? I have read quite a bit about > SS7 from Google and the part that is not discussed about is the > relationship of SS7 with VOIP. When is SS7 needed in VOIP and what kind > of benefits SS7 can deliver and how? > > Thanks alot for your info. > > Regards, > Mark > > > > > ___ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: >http://lists.digium.com/mailman/listinfo/asterisk-users ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
Alex Balashov wrote: > SS7 is _not_ used at the network edge, and is _not_ commonly used in > handoff to users, even ones who order very large amounts of access > circuits from a telco. Which is not to say that private SS7 links do not find their way into such situations on occasion, for various specialised applications. But if the question is, how is this brought to bear directly on VoIP... it's not. -- Alex Balashov Evariste Systems Web: http://www.evaristesys.com/ Tel: (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (706) 338-8599 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
mark morreny wrote: > Hi, > > I have read about SS7 recently and learnt that it is a signalling > protocol used in PSTN for call management, setup, etc. The thing that I > don't understand is how SS7 plays a role in VOIP. When I make calls > between landline and Asterisk via PSTN, I don't need to do anything with > SS7. Is it because the SS7 signalling is already done by Asterisk > already? From the prespective of implementing Asterisk, what kind of > SS7 support is needed? Is SS7 something needs to be concerned about > when using Asterisk with T1/E1? That depends entirely on the application of Asterisk. In general, as others have commented, SS7 does not play a role in VoIP and does not concern you as an Asterisk user. SS7 is an out-of-band signaling system is used inside telcos for trunking between network elements -- mainly softswitches or traditional big-iron TDM switches (such as the Lucent 5E, Nortel DMS, etc.) -- and to provide certain database access features used by that type of equipment and service provider, such as LNP (Local Number Portability information), CNAM (directory listings), certain billing processes, etc. SS7 operates on a carrier level and at global dimensions. In other words, the phone company's switches talk to each other -- and to other phone companies' switches -- using SS7. That is why it is irrelevant to your PSTN experience as an end-user. You never see any SS7. SS7 is _not_ used at the network edge, and is _not_ commonly used in handoff to users, even ones who order very large amounts of access circuits from a telco. These are typically done as PRI and ISDN PRI signaling is used to control them; that is a completely different animal than SS7 signaling. You can still aggregate PRIs into trunk groups, couple T1s full of B channels into one logical signaling group controlled by a single D channel using NFAS, etc. There is no need to do SS7 outside of an inter-carrier environment. So, while I don't know exactly what sort of service you are envisioning when you say "with T1/E1," if it's available to you, it probably does not use SS7. Where SS7 can become somewhat relevant is if you are a CLEC trying to get away with using Asterisk in some switching capacity, and are wanting to interconnect with a carrier in the full sense of the term (as in, actual interconnection, not access circuits). That's typically done over SS7. But Asterisk is completely the wrong tool for that job anyway. In other words, for all practical intents and purposes, you don't need SS7 and do not need to know about it. -- Alex Balashov Evariste Systems Web: http://www.evaristesys.com/ Tel: (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (706) 338-8599 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
Hi Mik Could you elaborate on what you mean by " SS7 allows you to receive large amounts of data, allows you to grow your network over 100 T1's, etc."? Why is SS7 a compusory requirement for a large network instead of "all" network? I have read quite a bit about SS7 from Google and the part that is not discussed about is the relationship of SS7 with VOIP. When is SS7 needed in VOIP and what kind of benefits SS7 can deliver and how? Thanks alot for your info. Regards, Mark ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
Hi Alex, I know what you are saying, but the thing is I still want to know what SS7 is about and when would someone needs to do something with it. It makes me uncomfortable to having such a missing link fully understood. I would appreciate if you can tell me more about the real SS7. Under what situation would SS7 become a topic that needs to be attended to in an Asterisk implementation? Thanks, Mark On Thu, May 15, 2008 at 4:02 AM, Alexander Lopez <[EMAIL PROTECTED]> wrote: > SS7 does NOT play a roll in VoIP. The SS7 signaling that you are > describing is not really SS7 but signaling over a PRI using ISDN that your > provider uses to exchange information via SS7 to the other carriers. > > > > To be blunt and I do not mean to be condescending in any way, but, if you > are using Asterisk and do not know what SS7 is, you don't need to worry > about it. > > > -- > > *From:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *On Behalf Of *mark morreny > *Sent:* Wednesday, May 14, 2008 3:52 PM > *To:* Asterisk Users Mailing List - Non-Commercial Discussion > *Subject:* [asterisk-users] Question about SS7 > > > > Hi, > > > > I have read about SS7 recently and learnt that it is a signalling protocol > used in PSTN for call management, setup, etc. The thing that I don't > understand is how SS7 plays a role in VOIP. When I make calls between > landline and Asterisk via PSTN, I don't need to do anything with SS7. Is it > because the SS7 signalling is already done by Asterisk already? From the > prespective of implementing Asterisk, what kind of SS7 support is needed? > Is SS7 something needs to be concerned about when using Asterisk with T1/E1? > > > > I hope someone can help me to clearify these doubts that I am having. > > > > Thanks, > > Mark > > ___ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
You can think of it like cable TV. You aren't required (at the moment) to have cable to receive television signals, but if you want extra features you have to go with cable (or something like it). With a PSTN line, you can make calls, send caller-id, etc. but SS7 allows you to receive large amounts of data, allows you to grow your network over 100 T1's, etc. Asterisk doesn't natively do SS7 signalling, but I know there are ways of doing it using third party drivers and soforth. Most importantly, you need a way to connect to a SS7 network (e.g. connection at a collocation). This is an overly simplistic explanation, but there's lots more information out there on the benefits. Mik mark morreny wrote: > Hi, > > I have read about SS7 recently and learnt that it is a signalling > protocol used in PSTN for call management, setup, etc. The thing that I > don't understand is how SS7 plays a role in VOIP. When I make calls > between landline and Asterisk via PSTN, I don't need to do anything with > SS7. Is it because the SS7 signalling is already done by Asterisk > already? From the prespective of implementing Asterisk, what kind of > SS7 support is needed? Is SS7 something needs to be concerned about > when using Asterisk with T1/E1? > > I hope someone can help me to clearify these doubts that I am having. > > Thanks, > Mark > > > > > ___ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: >http://lists.digium.com/mailman/listinfo/asterisk-users ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Question about SS7
SS7 does NOT play a roll in VoIP. The SS7 signaling that you are describing is not really SS7 but signaling over a PRI using ISDN that your provider uses to exchange information via SS7 to the other carriers. To be blunt and I do not mean to be condescending in any way, but, if you are using Asterisk and do not know what SS7 is, you don't need to worry about it. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of mark morreny Sent: Wednesday, May 14, 2008 3:52 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] Question about SS7 Hi, I have read about SS7 recently and learnt that it is a signalling protocol used in PSTN for call management, setup, etc. The thing that I don't understand is how SS7 plays a role in VOIP. When I make calls between landline and Asterisk via PSTN, I don't need to do anything with SS7. Is it because the SS7 signalling is already done by Asterisk already? From the prespective of implementing Asterisk, what kind of SS7 support is needed? Is SS7 something needs to be concerned about when using Asterisk with T1/E1? I hope someone can help me to clearify these doubts that I am having. Thanks, Mark ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] Question about SS7
Hi, I have read about SS7 recently and learnt that it is a signalling protocol used in PSTN for call management, setup, etc. The thing that I don't understand is how SS7 plays a role in VOIP. When I make calls between landline and Asterisk via PSTN, I don't need to do anything with SS7. Is it because the SS7 signalling is already done by Asterisk already? From the prespective of implementing Asterisk, what kind of SS7 support is needed? Is SS7 something needs to be concerned about when using Asterisk with T1/E1? I hope someone can help me to clearify these doubts that I am having. Thanks, Mark ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
