[Freeswitch-users] t38-passthru sofia param

Spencer Thomason spencer at 5ninesolutions.com
Thu Jun 30 23:25:50 MSD 2011

Just a quick follow up.  The fact that the reINVITE wasn't being passed correctly across the bridge was pilot error.. I had enable-soa=false on the profile.  I am however a little confused as when to use the t38-passthru parameter.    Is it needed even when doing bypass media or proxy media?

On Jun 30, 2011, at 11:40 AM, Spencer Thomason wrote:

> Hello all,
> I have a few questions regarding the t38-passthru sofia param.  One of the ways we are using FreeSWITCH is as a simple B2BUA in our SBCs.  The topology looks like this:
>                                             Freeswitch
>                                                /\          \/
> FS and Asterisk boxen -> OpenSIPS -> PSTN
> The Freeswitch instance is setup with inbound late negotiation and bypass media = true and the dialplan consists of a very simple bridge statement that sends a call back to the proxy.  
> The problem is that when someone sends a fax and the GW send a t.38 reINVITE, Freeswitch is sending the original SDP (PCMU in this case) back to Leg A and the fax then fails using PCMU.  Is this parameter needed when bypass media is already enabled?
> Thanks,
> Spencer
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