<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>
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        <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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                    > 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
                    >>> >>>
                    _______________________________________________
                    >>> Spce-user mailing list >>> <a moz-do-not-send="true" href="mailto:Spce-user@lists.sipwise.com">Spce-user@lists.sipwise.com</a>
                    >>> <a moz-do-not-send="true" href="http://lists.sipwise.com/listinfo/spce-user">http://lists.sipwise.com/listinfo/spce-user</a>
                    >> >>
                    _______________________________________________
                    >> Spce-user mailing list >> <a moz-do-not-send="true" href="mailto:Spce-user@lists.sipwise.com">Spce-user@lists.sipwise.com</a>
                    >> <a moz-do-not-send="true" href="http://lists.sipwise.com/listinfo/spce-user">http://lists.sipwise.com/listinfo/spce-user</a>
                    > > </p>
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