<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">From the error message, it looks like the remote fax drops the call when it sees no match between capabilities (it's the receiving fax who sends the preamble with its capabilities first.)</div><div class="">According to the source code, with v17 disabled, the max bitrate over t38 is 9600, else it's 14400. So I guess you need to enable v17 to communicate with faxes with min bitrates greater than 9600.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Best Regards,<br class="">-- <br class="">Vallimamod Abdullah</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">SIP Solutions</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><a href="mailto:vma@sipsolutions.fr" class="">vma@sipsolutions.fr</a><br class="">.</div></div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On 28 Feb 2018, at 02:32, Andrew <<a href="mailto:asims1979@hotmail.com" class="">asims1979@hotmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">Hi all,</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div>We've been trying to get our fax implementation as reliable as possible using FS; we've had some great results with inbound faxes with the following items set in the incoming dial-plan:<div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p><div class=""><div class="">action application ="answer"/><br class="">action application="playback" data="silence_stream://2000"/></div>action set ignore_early_media=true<br class="">action set absolute_codec_string='PCMU,PCMA'<br class="">action set fax_enable_t38=true<br class="">action set fax_verbose=true<br class="">action set fax_use_ecm=true<br class="">action set disable-v17=true<br class="">action set fax_v17_disabled=true<br class="">action set fax_disable_v17=true<br class="">action set fax_enable_t38_request=true<br class=""><span class="">application rxfax <span class="">/tmp/FAX-IN-${uuid}.tif</span></span></div><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p><div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class="">application hangup</span></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class="">The one thing that we have identified with this configuration is that 99% of inbound faxes come through fine when the fax transfer rate is negotiated at 9600 bps (as a result of the<span class="">fax_v17_disabled=true</span><span class="Apple-converted-space"> </span>setting).<br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">However, we still see quite a few incoming faxes reported as coming in with a<span class="Apple-converted-space"> </span><span class="">fax transfer rate</span><span class="Apple-converted-space"> </span>of 14400 bps, which have a 100% fail rate.</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">I understand that the two ends need to negotiate a rate; but how do we force (or only offer) the rate of 9600 or lower? My understanding is that<span class="Apple-converted-space"> </span><span class="">the fax_v17_disabled=true setting should cover that? My first thought was that the remote end was forcing the rate at 14400, regardless of what we were sending back in terms of fax capabilities.</span></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class=""><br class=""></span></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class="">Not sure if it helps, but the two error messages we receive when faxes fail due to the 14400 rate are:<br class=""></span></div><p style="margin-top: 0px; margin-bottom: 0px;" class=""><span class=""></span></p><div class="">- Unexpected DCN while waiting for DCS or DIS, and<br class=""><div class="">- The call dropped prematurely<span class="Apple-converted-space"> </span><br class=""></div><span class=""></span><span class=""><br class="">My thought was, If we could find a way to get all faxes coming in at 9600, we'd be able to improve the reliability.<span class="Apple-converted-space"> </span><br class=""><br class="">Looking through the wiki and previous list messages, the<span class="Apple-converted-space"> </span><span class="">fax_disable_v17=true</span><span class="Apple-converted-space"> </span>setting seems to be the documented approach, but I'm not sure why we're still seeing faxes come in at a higher rate.<br class=""><br class="">Any advice on this or are we missing something with regards to locking in the lower speed?<br class=""><br class="">cheers,<br class="">A<br class=""></span></div><p style="margin-top: 0px; margin-bottom: 0px;" class=""></p><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div></div><span style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_________________________________________________________________________</span><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Professional FreeSWITCH Consulting Services:</span><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:consulting@freeswitch.org" style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">consulting@freeswitch.org</a><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="http://www.freeswitchsolutions.com/" style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">http://www.freeswitchsolutions.com</a><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Official FreeSWITCH Sites</span><br style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="http://www.freeswitch.org/" style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; 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font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">UNSUBSCRIBE:</span><a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" style="font-family: Monaco; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br style="font-family: Monaco; 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