<div>On average or failure rate is below 5%, however there are some senders with failure rates as high as 80%. We usually reach out to them and ask them to turn off ECM and some transmit speed to 9600. In response to some of the comments.</div><div><br></div><div>We have MGCP and SIP internally with 99.9% success rate. </div><div><br></div><div>We have both SIP to PRI and SIP to SIP for external. Carrier is Level 3. We used to have AT&T but had the same problem. </div><div><br></div><div>Outbound faxing from the Rightfax server is fine. It's only with inbound faxing that we have this problem. This is why I'm questioning a server setting. It doesn't make sense to me that the server would toss out the fax just because there was a single RTN message sent, especially when the packet capture shows the sending device complied with the message, slowed it's transmit speed and finished the fax without any further issue. </div><div><br></div><div>On the positive side, working on this over the past year has really helped me to build my FoIP skills, and faxing within the test of our network is rock solid 😀</div><div><br></div><div><br><div class="gmail_quote"><div>On Thu, Apr 6, 2017 at 7:04 AM Scott Voll <<a href="mailto:svoll.voip@gmail.com">svoll.voip@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_msg">Wow Frank, that is a lot of troubleshooting, and a great run down.<div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Can I ask what your failure rate is?</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">We have about a 2-4% failure rate and have decided not to troubleshoot those as they tend to be a Telco issue between us and the sender. We use a lot of toll bypass so if it doesn't work over a pri then we send it out another one. Usually fixes most of our problems ;-)</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Scott</div><div class="gmail_msg"><br class="gmail_msg"></div></div><div class="gmail_extra gmail_msg"><br class="gmail_msg"><div class="gmail_quote gmail_msg"></div></div><div class="gmail_extra gmail_msg"><div class="gmail_quote gmail_msg">On Wed, Apr 5, 2017 at 5:06 PM, Frank Arrasmith <span class="gmail_msg"><<a href="mailto:frank.arrasmith@gmail.com" class="gmail_msg" target="_blank">frank.arrasmith@gmail.com</a>></span> wrote:<br class="gmail_msg"></div></div><div class="gmail_extra gmail_msg"><div class="gmail_quote gmail_msg"><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_msg"><div class="gmail_msg">Calling all Rightfax gurus,<br class="gmail_msg"></div><div class="gmail_msg"> I have the following question regarding the Rightfax configuration and transmission errors. <br class="gmail_msg"><br class="gmail_msg">Background:<br class="gmail_msg">My enterprise has CUCM 10.5 with a pretty dialed in Fax/T38 setup over SIP and MGCP gateways. For the most part, faxing is pretty solid inbound and outbound to and from PSTN GW's, CUBEs, ,analog VG's, and regular fax machines(we have a lot). We have a SIP trunk connected to Rightfax 10.5 server, which is managed by another group where we have limited access/experience with Rightfax configuration settings. It took us awhile to get the Rightfax servers with the correct t38 setup because they had only run traditional CAS T1 prior to us, so it was new to everyone, but it is up and stable except for the following issue.. <br class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Symptom :<br class="gmail_msg"></div><div class="gmail_msg">The problem we see with Rightfax is with Transmission errors. It starts with our internal customers reporting that they do not receive a fax even when the sender receives confirmation. Upon further review we see that the suspect call is listed as a "Transmission Error" in Rightfax, so the fax never gets delivered to the customers account/mailbox even though the call completes.<br class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Analysis:<br class="gmail_msg"></div><div class="gmail_msg">Since we are running T38, we can packet capture at the server, and we see normal fax protocol exchange, except for the suspect calls where we see "RTN" Messages. My understanding of the T.30 protocol is that when a RTN message is delivered to the sender, that is an indication for the sender to slow down and resend the last page. We actually see in the messages where the RTN message gets sent, and the sender complies with the notice, and sends again at 12000, then call completes as normal with an EOP message and a DCN message. In these cases,the Rightfax team actually looks at the fax image and may see a bit of blurriness, but perfectly legible text ,even tho its still marked as transmission failure. We have asked them if there is a setting that can be tuned where the RTN does not cause the service to mark the transmission as failure. To this they reply, "It was working fine before when we were on CAS, so it must be on your end." <br class="gmail_msg"><br class="gmail_msg"> I understand where there are cases where the RTN message is sent
because the call quality is actually terrible, but in those cases, there
is usually several RTN messages and the sender will drop down to 4800 or below ,
and then usually give up and the call will fail. This type of failure is rare (unless we have a major outage) and in this case the sending fax sees that it failed and will proceed with its normal retries. <br class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Question:<br class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Is this RTN to transmission failure hard coded, or is this a configurable setting? If this were a regular fax machine, i think this would be a non issue as the receiver would see the crappy page as well as the good copy of that was sent again in their bundle of received pages. <br class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Any insight is greatly appreciated and for anyone just getting into FAX over IP with Cisco, I highly recommend the following book and Cisco Live presentations from these guys from Cisco TAC.<br class="gmail_msg"><br class="gmail_msg"><a class="m_6864979703474130330m_-3904345199325633192gmail-sh-t__title gmail_msg" href="https://www.google.com/aclk?sa=l&ai=DChcSEwiXgOn0wY7TAhXJCioKHRVCANoYABAMGgJ0bQ&sig=AOD64_1ddnEIE3WNy8NH5g7yJ-WnrcChJA&ctype=5&q=&ved=0ahUKEwjei-P0wY7TAhUnj1QKHejtCy0QwzwIEg&adurl=" target="_blank">Fax, Modem, and Text for IP Telephony [Book]</a><div class="m_6864979703474130330m_-3904345199325633192gmail-_-cQ gmail_msg">from <span class="m_6864979703474130330m_-3904345199325633192gmail-_-cR gmail_msg">Textbooks.com</span></div><span class="m_6864979703474130330m_-3904345199325633192gmail-_-bj gmail_msg">by David Hanes, Gonzalo Salgueiro<br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"></span></div><div class="gmail_msg"><span class="m_6864979703474130330m_-3904345199325633192gmail-_-bj gmail_msg">Thanks,<br class="gmail_msg"></span></div><div class="gmail_msg"><span class="m_6864979703474130330m_-3904345199325633192gmail-_-bj gmail_msg"> Frank <br class="gmail_msg"><br class="gmail_msg"><br class="gmail_msg"></span></div></div>
<br class="gmail_msg"></blockquote></div></div><div class="gmail_extra gmail_msg"><div class="gmail_quote gmail_msg"><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">_______________________________________________<br class="gmail_msg">
cisco-voip mailing list<br class="gmail_msg">
<a href="mailto:cisco-voip@puck.nether.net" class="gmail_msg" target="_blank">cisco-voip@puck.nether.net</a><br class="gmail_msg">
<a href="https://puck.nether.net/mailman/listinfo/cisco-voip" rel="noreferrer" class="gmail_msg" target="_blank">https://puck.nether.net/mailman/listinfo/cisco-voip</a><br class="gmail_msg">
<br class="gmail_msg"></blockquote></div><br class="gmail_msg"></div>
</blockquote></div></div>