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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