You can interrogate the SIP information for some of this using the SIP debug
command on the CLI along with the udptl debug command. It's not perfect but
it works for what you're looking for.
On Tue, Feb 26, 2008 at 3:21 PM, Robert Moskowitz <rgm at htt-consult.com>
wrote:
> I am running Trixbox 2.4 which has Asterisk 1.4.18-1
>
> I have kind of followed:
> http://www.voip-info.org/tiki-index.php?page=Asterisk%20T.38
>
> I added to sip_general_custom.conf
>
> ;NEEDED!!!
> t38pt_udptl = yes
>
> I did not add this to the actual SIP extension, as I assumed this being
> general it applies to all sip extensions, and doing a sip show peer ext#
> did indeed come up with t38pt_udptl = yes
>
> The fax is attached to a Grandstream 488, so I set it for fax mode: T.38
>
> I did leave DTMF as inband (can't find any docs on what to use for
this).
> my rx_fax works just fine, but it did for fax pass-through.
>
> So how do I determine if T.38 was negotiated?
>
>
>
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