[Spce-user] Fwd: Re: Blacklist t.38 fax codec

[Matthew Ogden]

I think the problem is, a 488 will stop the call altogether?



I cant recall, but if you get a 488 in a REINVITE, will the call not
terminate after that, or does it “failback” to leaving t38 un-negotiated…
might be device dependent?



*From:* spce-user-bounces at lists.sipwise.com [mailto:
spce-user-bounces at lists.sipwise.com] *On Behalf Of *Leopoldo Iglesia
*Sent:* 20 June 2014 01:55 PM
*To:* spce-user at lists.sipwise.com
*Subject:* Re: [Spce-user] Fwd: Re: Blacklist t.38 fax codec



Ok. "has_totag" where is located ??

El 20/06/2014 13:35, Daniel Grotti escribió:

I have nothing ready to give you right now.
Basically on kamailio proxy you should match a Re-invite (using the
"has_totag") and check if SDP contains t38 headers/codec (just have a look
how the T38 reinvite looks like).
So, if you receive a re-invite with T38 headers into SDP, just send back a
488 reply.

Daniel





On 06/20/2014 01:28 PM, Leopoldo Iglesia wrote:

Fine, how can I do this hack? cause endpoints is impossible to mod config,
so they are rented and provisioned by an ftth operator.

El 20/06/2014 13:23, Daniel Grotti escribió:

Hi,
I think you need to avoid to forward the T38 Re-INVITE, so you should hack
your SPCE in order to reply to the T38 re-invite with a "488 Not acceptable
here", for example.
So the sender SHOULD fallback to G711.
Anyway, the best solution if you have endpoint with t38 enabled but they
don't work well, is to disable t38.


Daniel



On 06/20/2014 01:15 PM, Leopoldo Iglesia wrote:


> But both endpoints support it, that is the problem and the only >
scenario when it fails, so i want SPCE not to send Fax negotiation to >
endpoint,.



 El 20/06/2014 12:12, Daniel Grotti escribió: >> Hi, >> that's strange, if
one of the endpoints try to switch to t38 and the >> other endpoint doesn't
support it, they should fallback to G711. >> >> Daniel >> >> >> >> >> >> >>
On 06/20/2014 01:33 AM, Leopoldo Iglesia wrote: >>> How can I, blacklist
t.38 to avoid endpoints to try t38 negotiation? >>> >>> When i call from
ericcson ont to fax capable endpoint, it try to >>> connect t38 fax and
There is no voice. >>> >>> Thanks >>> >>> Leopoldo iglesia >>> >>>
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