[asterisk-ss7] SS7 + T1 on Asterisk?

[Michael Mueller]

whew - i was choking on "SS7 on BRI"

typical in US/Canada is T1 or DS0A (inside the switch office only);
some other 56/64 interfaces are DSCS and V.35

http://en.wikipedia.org/wiki/DS0A

Asterisk users need only be concerned with T1, however

On Fri, Dec 9, 2011 at 12:43 PM, Jan Berger <janvb at live.com> wrote:
> Sorry - correcting myself - 56kbps is used on T1's with CAS.
>
> ________________________________
> From: janvb at live.com
> To: asterisk-ss7 at lists.digium.com
> Date: Fri, 9 Dec 2011 18:36:33 +0100
>
> Subject: Re: [asterisk-ss7] SS7 + T1 on Asterisk?
>
> http://en.wikipedia.org/wiki/Digital_Signal_1
>
> I believe it's BRI lines that uses 56kbps and your right that SS7 on BRI
> have some usage in US.
>
> Jan
>> Date: Wed, 7 Dec 2011 20:12:22 -0200
>> From: marcelo at m2j.com.br
>> To: asterisk-ss7 at lists.digium.com
>> Subject: Re: [asterisk-ss7] SS7 + T1 on Asterisk?
>>
>> Typically T1 (american) signaling ss7 links run at 56kbps instead of
>> 64kbps.
>> If your switch can run 64kbps links over a T1 timeslot, than the only
>> remaining variable is ITU versus ANSI ISUP. They are incompatible
>> (different message formats due to different network address sizes and
>> other details).
>> We use ITU ISUP all over the place without trouble. If the switch can do
>> 64kbps links and ITU ISUP, then you should be able to use all existing
>> E1 direct connection samples (without STP), except for the obvious E1=31
>> timeslots while T1=24 timeslots difference..
>> ANSI might work. I won't go there because I have zero experience with
>> ANSI SS7/ISUP (stability wise).
>> With 2 T1 and a single signaling link it should allow for 47 voice
>> channels and one signaling link.
>>
>> Search for libss7 ansi 56kbps for the most difficult scenario. But if
>> you can do ITU ISUP + 64kbps links, I would suggest that instead.
>> We hardly see people talking about ANSI ISUP setups on this list, so it
>> could be far less stable (at least it seems to get less usage).
>>
>> On 12/07/11 16:25, Matt wrote:
>> > In this case, our supplier is ourselves. We have a DMS100, but the
>> > switch guy is someone other than myself - I am the IP guy.
>> >
>> > So basically if I understand you properly, I should be able to do the
>> > SS7+T1 and get proper operation, provided the configuration on both
>> > sides is right.
>> >
>> > On Wed, Dec 7, 2011 at 1:06 PM, Marcelo Pacheco<marcelo at m2j.com.br>
>> > wrote:
>> >> If the DMS100 switch can talk signalling directly with Asterisk,
>> >> without an
>> >> STP, it should be possible to use a single timeslot for ss7 signalling,
>> >> so
>> >> with 2 T1 you could have 47 voice calls and one signalling channel.
>> >> This is
>> >> common with E1 setups. Also with E1 its common for a timeslot to be
>> >> statically switched over to an STP (semi permanent call), allowing for
>> >> access to the signaling network without a dedicated physically separate
>> >> signaling link, but that's not usual in T1 land.
>> >>
>> >> But what you ask is technically possible... However its important to
>> >> PROPERLY LEARN SS7 terms to be able to communicate with your supplier.
>> >> SS7 is a CARRIER LEVEL PROTOCOL. However people insist on winging it
>> >> without
>> >> proper training.
>> >> Its like trying to become a backbone internet provider without properly
>> >> learning inter and intra network routing protocols (like BGP and OSPF).
>> >>
>> >> If you knew the general SS7/ISUP knowledge, you could quickly find the
>> >> information you're looking for on Google.
>> >>
>> >> PS: I live in E1 land... I'm just quoting information from the top of
>> >> my
>> >> head. I have no need for T1+SS7. E1+SS7 is a little simpler with
>> >> Asterisk
>> >> than T1+SS7 due to 56kbps data links, ANSI ISUP/SS7 and some other
>> >> quirks.
>> >>
>> >> Good luck. You'll need it.
>> >>
>> >>
>> >> On 12/07/11 14:47, Matt wrote:
>> >>> If I were to get a 2 span T1 card for Asterisk... and connect it to a
>> >>> Nortel DMS100... can I run call traffic over the T1 and run SS7
>> >>> signaling FOR the T1 over the other port?
>> >>>
>> >>> Is there documentation on doing this anywhere?
>> >>>
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