<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I'll Try this :)<br><br>Leopoldo iglesia </div><div><br>El 20/06/2014, a las 14:24, Daniel Grotti <<a href="mailto:dgrotti@sipwise.com">dgrotti@sipwise.com</a>> escribió:<br><br></div><blockquote type="cite"><div>
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<div class="moz-cite-prefix">Could be,<br>
as I see also the normal t38 negotiation is client-dependent....it
<br>
<br>
But from RFC3261:<br>
<br>
During the session, either Alice or Bob may decide to change the<br>
characteristics of the media session. This is accomplished by<br>
sending a re-INVITE containing a new media description. This
re-<br>
INVITE references the existing dialog so that the other party
knows<br>
that it is to modify an existing session instead of
establishing a<br>
new session. The other party sends a 200 (OK) to accept the
change.<br>
The requestor responds to the 200 (OK) with an ACK. If the
other<br>
party does not accept the change, he sends an error response
such as<br>
488 (Not Acceptable Here), which also receives an ACK.
However, the<br>
failure of the re-INVITE does not cause the existing call to
fail -<br>
the session continues using the previously negotiated<br>
characteristics.<br>
<br>
<br>
<br>
Daniel<br>
<br>
<br>
<br>
<br>
On 06/20/2014 02:08 PM, Matthew Ogden wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I
think the problem is, a 488 will stop the call altogether?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">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?</span></p>
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<b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">
<a moz-do-not-send="true" href="mailto:spce-user-bounces@lists.sipwise.com">spce-user-bounces@lists.sipwise.com</a>
[mailto:<a moz-do-not-send="true" href="mailto:spce-user-bounces@lists.sipwise.com">spce-user-bounces@lists.sipwise.com</a>]
<b>On Behalf Of </b>Leopoldo Iglesia<br>
<b>Sent:</b> 20 June 2014 01:55 PM<br>
<b>To:</b> <a moz-do-not-send="true" href="mailto:spce-user@lists.sipwise.com">spce-user@lists.sipwise.com</a><br>
<b>Subject:</b> Re: [Spce-user] Fwd: Re: Blacklist t.38
fax codec</span></p>
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<p class="MsoNormal">Ok. "has_totag" where is located ??<br>
<br>
El 20/06/2014 13:35, Daniel Grotti escribió:</p>
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I have nothing ready to give you right now.<br>
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).<br>
So, if you receive a re-invite with T38 headers into SDP,
just send back a 488 reply.<br>
<br>
Daniel<br>
<br>
<br>
<br>
<br>
<br>
On 06/20/2014 01:28 PM, Leopoldo Iglesia wrote:</p>
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<p class="MsoNormal">Fine, how can I do this hack? cause
endpoints is impossible to mod config, so they are
rented and provisioned by an ftth operator.<br>
<br>
El 20/06/2014 13:23, Daniel Grotti escribió:</p>
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<p class="MsoNormal">Hi,<br>
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.<br>
So the sender SHOULD fallback to G711.<br>
Anyway, the best solution if you have endpoint with
t38 enabled but they don't work well, is to disable
t38.<br>
<br>
<br>
Daniel<br>
<br>
<br>
<br>
On 06/20/2014 01:15 PM, Leopoldo Iglesia wrote:</p>
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<p class="MsoNormal"><br>
> 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,.<br>
<br>
<br>
<br>
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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