<html><head><base href="x-msg://18/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>Just as a remark, there were a lot of BRI lines in USA using 64k. We ran ISDN videoconference stations in AT&T CALA to US in early 2000's (using AT&T and Sprint networks). They'd some DS1 with 64k channels to support international Nx64k calls with ANSI ISUP, but I'm not sure if that network remains active.</div><div>Anyway, that was just a comment about this interesting subject.</div><div><br></div><div>Gustavo</div><div><br></div><div><br><div><div>On Dec 9, 2011, at 11:36 AM, Jan Berger wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div class="hmmessage" style="font-size: 10pt; font-family: Tahoma; "><div dir="ltr"><a href="http://en.wikipedia.org/wiki/Digital_Signal_1">http://en.wikipedia.org/wiki/Digital_Signal_1</a><br> <br>I believe it's BRI lines that uses 56kbps and your right that SS7 on BRI have some usage in US.<br> <br>Jan <br><div>> Date: Wed, 7 Dec 2011 20:12:22 -0200<br>> From:<span class="Apple-converted-space"> </span><a href="mailto:marcelo@m2j.com.br">marcelo@m2j.com.br</a><br>> To:<span class="Apple-converted-space"> </span><a href="mailto:asterisk-ss7@lists.digium.com">asterisk-ss7@lists.digium.com</a><br>> Subject: Re: [asterisk-ss7] SS7 + T1 on Asterisk?<br>><span class="Apple-converted-space"> </span><br>> Typically T1 (american) signaling ss7 links run at 56kbps instead of 64kbps.<br>> If your switch can run 64kbps links over a T1 timeslot, than the only<span class="Apple-converted-space"> </span><br>> remaining variable is ITU versus ANSI ISUP. They are incompatible<span class="Apple-converted-space"> </span><br>> (different message formats due to different network address sizes and<span class="Apple-converted-space"> </span><br>> other details).<br>> We use ITU ISUP all over the place without trouble. If the switch can do<span class="Apple-converted-space"> </span><br>> 64kbps links and ITU ISUP, then you should be able to use all existing<span class="Apple-converted-space"> </span><br>> E1 direct connection samples (without STP), except for the obvious E1=31<span class="Apple-converted-space"> </span><br>> timeslots while T1=24 timeslots difference..<br>> ANSI might work. I won't go there because I have zero experience with<span class="Apple-converted-space"> </span><br>> ANSI SS7/ISUP (stability wise).<br>> With 2 T1 and a single signaling link it should allow for 47 voice<span class="Apple-converted-space"> </span><br>> channels and one signaling link.<br>><span class="Apple-converted-space"> </span><br>> Search for libss7 ansi 56kbps for the most difficult scenario. But if<span class="Apple-converted-space"> </span><br>> you can do ITU ISUP + 64kbps links, I would suggest that instead.<br>> We hardly see people talking about ANSI ISUP setups on this list, so it<span class="Apple-converted-space"> </span><br>> could be far less stable (at least it seems to get less usage).<br>><span class="Apple-converted-space"> </span><br>> On 12/07/11 16:25, Matt wrote:<br>> > In this case, our supplier is ourselves. We have a DMS100, but the<br>> > switch guy is someone other than myself - I am the IP guy.<br>> ><br>> > So basically if I understand you properly, I should be able to do the<br>> > SS7+T1 and get proper operation, provided the configuration on both<br>> > sides is right.<br>> ><br>> > On Wed, Dec 7, 2011 at 1:06 PM, Marcelo Pacheco<<a href="mailto:marcelo@m2j.com.br">marcelo@m2j.com.br</a>> wrote:<br>> >> If the DMS100 switch can talk signalling directly with Asterisk, without an<br>> >> STP, it should be possible to use a single timeslot for ss7 signalling, so<br>> >> with 2 T1 you could have 47 voice calls and one signalling channel. This is<br>> >> common with E1 setups. Also with E1 its common for a timeslot to be<br>> >> statically switched over to an STP (semi permanent call), allowing for<br>> >> access to the signaling network without a dedicated physically separate<br>> >> signaling link, but that's not usual in T1 land.<br>> >><br>> >> But what you ask is technically possible... However its important to<br>> >> PROPERLY LEARN SS7 terms to be able to communicate with your supplier.<br>> >> SS7 is a CARRIER LEVEL PROTOCOL. However people insist on winging it without<br>> >> proper training.<br>> >> Its like trying to become a backbone internet provider without properly<br>> >> learning inter and intra network routing protocols (like BGP and OSPF).<br>> >><br>> >> If you knew the general SS7/ISUP knowledge, you could quickly find the<br>> >> information you're looking for on Google.<br>> >><br>> >> PS: I live in E1 land... I'm just quoting information from the top of my<br>> >> head. I have no need for T1+SS7. E1+SS7 is a little simpler with Asterisk<br>> >> than T1+SS7 due to 56kbps data links, ANSI ISUP/SS7 and some other quirks.<br>> >><br>> >> Good luck. You'll need it.<br>> >><br>> >><br>> >> On 12/07/11 14:47, Matt wrote:<br>> >>> If I were to get a 2 span T1 card for Asterisk... and connect it to a<br>> >>> Nortel DMS100... can I run call traffic over the T1 and run SS7<br>> >>> signaling FOR the T1 over the other port?<br>> >>><br>> >>> Is there documentation on doing this anywhere?<br>> >>><br>> >>> --<br>> >>> _____________________________________________________________________<br>> >>> -- Bandwidth and Colocation Provided by<span class="Apple-converted-space"> </span><a href="http://www.api-digital.com">http://www.api-digital.com</a><span class="Apple-converted-space"> </span>--<br>> >>><br>> >>> asterisk-ss7 mailing list<br>> >>> To UNSUBSCRIBE or update options visit:<br>> >>><span class="Apple-converted-space"> </span><a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7">http://lists.digium.com/mailman/listinfo/asterisk-ss7</a><br>> >>><br>> >><br>> >> --<br>> >> _____________________________________________________________________<br>> >> -- Bandwidth and Colocation Provided by<span class="Apple-converted-space"> </span><a href="http://www.api-digital.com">http://www.api-digital.com</a><span class="Apple-converted-space"> </span>--<br>> >><br>> >> asterisk-ss7 mailing list<br>> >> To UNSUBSCRIBE or update options visit:<br>> >><span class="Apple-converted-space"> </span><a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7">http://lists.digium.com/mailman/listinfo/asterisk-ss7</a><br>> > --<br>> > _____________________________________________________________________<br>> > -- Bandwidth and Colocation Provided by<span class="Apple-converted-space"> </span><a href="http://www.api-digital.com">http://www.api-digital.com</a><span class="Apple-converted-space"> </span>--<br>> ><br>> > asterisk-ss7 mailing list<br>> > To UNSUBSCRIBE or update options visit:<br>> ><span class="Apple-converted-space"> </span><a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7">http://lists.digium.com/mailman/listinfo/asterisk-ss7</a><br>> ><br>><span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br>> --<br>> _____________________________________________________________________<br>> -- Bandwidth and Colocation Provided by<span class="Apple-converted-space"> </span><a href="http://www.api-digital.com">http://www.api-digital.com</a><span class="Apple-converted-space"> </span>--<br>><span class="Apple-converted-space"> </span><br>> asterisk-ss7 mailing list<br>> To UNSUBSCRIBE or update options visit:<br>><span class="Apple-converted-space"> </span><a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7">http://lists.digium.com/mailman/listinfo/asterisk-ss7</a><br></div></div>--<br>_____________________________________________________________________<br>-- Bandwidth and Colocation Provided by<span class="Apple-converted-space"> </span><a href="http://www.api-digital.com">http://www.api-digital.com</a><span class="Apple-converted-space"> </span>--<br><br>asterisk-ss7 mailing list<br>To UNSUBSCRIBE or update options visit:<br> <a href="http://lists.digium.com/mailman/listinfo/asterisk-ss7">http://lists.digium.com/mailman/listinfo/asterisk-ss7</a></div></blockquote></div><br></div></div></body></html>