FreeTDM - any good for legacy CAS T1 protocols?
Hello all, I have a project coming up that will require me to interface Freeswitch to some rather arcane legacy T1 protocols. Specifically digital loop start, and station-side digital loop start. I'm concerned that the userland support for these may be incomplete or even non-existent in FreeTDM. I've successfully used FreeTDM to connect to PRI, but when I look for span configuration options for CAS T1, the only things that I see that may be applicable are described as "analog" options, and that doesn't sound quite right for loop start on T1 channels (but I could be wrong about that). If I were to use Asterisk for this, I would configure chan_dahdi.conf for " signalling=fxs_ls" and/or "signalling=fxo_ls". Should I pursue using FreeTDM for this, or would I be smarter to incorporate a simple Asterisk gateway to handle this legacy CAS T1 signaling? Thanks, Bob
Hi Bob, can't comment on FreeTDM, but before using a whole Asterisk box as media gateway, maybe it is possible to use a dedicated media gateway appliance. We've stopped using TDM cards altogether and use Patton Smartnode MGWs where possible, it's just much easier to integrate/replace/upgrade/downgrade/backup. No drivers and hardware dependencies needed on the PBX host(s) and it works perfect with FreeSWITCH and Asterisk. The Manual says it can do rbs with loop-start as exchange or subscriber. I don't know if that fits your requirement, we use E1/q921/DSS1 here in Germany. Also, I don't want to sound like an advertisement, but we're just that happy with having switched from TDM cards to MGWs. :) Regards, Markus On Wed, Jun 11, 2014 at 5:37 PM, Bob Hartwig <bobjects@gmail.com> wrote:
Hello all,
I have a project coming up that will require me to interface Freeswitch to some rather arcane legacy T1 protocols. Specifically digital loop start, and station-side digital loop start. I'm concerned that the userland support for these may be incomplete or even non-existent in FreeTDM.
I've successfully used FreeTDM to connect to PRI, but when I look for span configuration options for CAS T1, the only things that I see that may be applicable are described as "analog" options, and that doesn't sound quite right for loop start on T1 channels (but I could be wrong about that). If I were to use Asterisk for this, I would configure chan_dahdi.conf for " signalling=fxs_ls" and/or "signalling=fxo_ls".
Should I pursue using FreeTDM for this, or would I be smarter to incorporate a simple Asterisk gateway to handle this legacy CAS T1 signaling?
Thanks, Bob
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So "analog" options doesn't sound right for a T1 on Freeswitch, but choosing "loop start" sounds perfectly normal for Asterisk? Hint - they aren't digital loops you are starting. Regards, Steve On 06/11/2014 11:37 PM, Bob Hartwig wrote:
Hello all,
I have a project coming up that will require me to interface Freeswitch to some rather arcane legacy T1 protocols. Specifically digital loop start, and station-side digital loop start. I'm concerned that the userland support for these may be incomplete or even non-existent in FreeTDM.
I've successfully used FreeTDM to connect to PRI, but when I look for span configuration options for CAS T1, the only things that I see that may be applicable are described as "analog" options, and that doesn't sound quite right for loop start on T1 channels (but I could be wrong about that). If I were to use Asterisk for this, I would configure chan_dahdi.conf for "signalling=fxs_ls" and/or "signalling=fxo_ls".
Should I pursue using FreeTDM for this, or would I be smarter to incorporate a simple Asterisk gateway to handle this legacy CAS T1 signaling?
Thanks, Bob
Hi, I could test time ago a digium card with an alcatel oxe using an E1 line-side. I could not make a full set of test like transfer or hold. Also I can not recall if I use asterisk or freeswitch, i think I used fs but i can not be sure. What I can tell the settings was quite stright forward. The only issue what I got was about user persimision freetdm to run dahdi. I think you question could be answered by Moises Silva who is the main constributor of FreeTDM. I found this on net, coul help you test: http://www.marshut.com/iwxvu/freetdm-rbs-configuration-for-multi-port-cards.... Ah Steve (maybe I do not understand your response) .... fxs and fxo in a digital E1 is posible. Some fabricants use CAS to emulate a fxs station in each circuit, so you can get 30 "analog" station in a E1. This protocol have presence in several pbx (Alcatel, Nortel, Meridian, Siemens, Avaya, etc) and is used by IVR. Just for infomation look at: http://www.nmscommunications.com/swDocs/Docs/6709-23/ops_signaling_.html It is a protocol very nice and simple
On June 12, 2014 at 8:55 AM Steve Underwood <steveu@coppice.org> wrote:
So "analog" options doesn't sound right for a T1 on Freeswitch, but choosing "loop start" sounds perfectly normal for Asterisk? Hint - they aren't digital loops you are starting.
Regards, Steve
On 06/11/2014 11:37 PM, Bob Hartwig wrote:
Hello all,
I have a project coming up that will require me to interface Freeswitch to some rather arcane legacy T1 protocols. Specifically digital loop start, and station-side digital loop start. I'm concerned that the userland support for these may be incomplete or even non-existent in FreeTDM.
I've successfully used FreeTDM to connect to PRI, but when I look for span configuration options for CAS T1, the only things that I see that may be applicable are described as "analog" options, and that doesn't sound quite right for loop start on T1 channels (but I could be wrong about that). If I were to use Asterisk for this, I would configure chan_dahdi.conf for "signalling=fxs_ls" and/or "signalling=fxo_ls".
Should I pursue using FreeTDM for this, or would I be smarter to incorporate a simple Asterisk gateway to handle this legacy CAS T1 signaling?
Thanks, Bob
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com
Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
Bob, I am using CAS/RBS T1’s in production now on several FS servers with Sangoma hardware to act as SIP/TDM gateways. I have worked with Moises on a Jira, several enhancements, and configuration assistance in the past to further this along for me. Post your questions and I will do my best to let you know what I have done. Maybe some of it would work for you. Brian Edgar From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Bob Hartwig Sent: Wednesday, June 11, 2014 11:38 AM To: FreeSWITCH Users Help Subject: [Freeswitch-users] FreeTDM - any good for legacy CAS T1 protocols? Hello all, I have a project coming up that will require me to interface Freeswitch to some rather arcane legacy T1 protocols. Specifically digital loop start, and station-side digital loop start. I'm concerned that the userland support for these may be incomplete or even non-existent in FreeTDM. I've successfully used FreeTDM to connect to PRI, but when I look for span configuration options for CAS T1, the only things that I see that may be applicable are described as "analog" options, and that doesn't sound quite right for loop start on T1 channels (but I could be wrong about that). If I were to use Asterisk for this, I would configure chan_dahdi.conf for "signalling=fxs_ls" and/or "signalling=fxo_ls". Should I pursue using FreeTDM for this, or would I be smarter to incorporate a simple Asterisk gateway to handle this legacy CAS T1 signaling? Thanks, Bob
participants (5)
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bedgar＠vseinc.com
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Bob Hartwig
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dgarcia＠anew.com.ve
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Markus Lindenberg
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Steve Underwood