Turns out I had my timing sources setup incorrectly, so the te820 wasn't synchronizing with the Telco. Turns out the spandsp FAQs are pretty good for diagnosing: http://www.soft-switch.org/spandsp_faq/ar01s08.html
-Justin ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Justin Killen Sent: Thursday, November 14, 2013 3:28 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] recieve fax from PRI using spandsp 65% failure rate Hi, On one of our servers, we're having problems with incoming faxes. The connections come in through a PRI into a Digium TE820 card. 'fax show stats' yields the following: FAX Statistics: --------------- Current Sessions : 0 Reserved Sessions : 0 Transmit Attempts : 0 Receive Attempts : 740 Completed FAXes : 740 Failed FAXes : 486 Spandsp G.711 Success : 254 Switched to T.38 : 0 Call Dropped : 46 No FAX : 0 Negotiation Failed : 0 Train Failure : 4 Retries Exceeded : 20 Protocol Error : 219 TX Protocol Error : 44 RX Protocol Error : 153 File Error : 0 Memory Error : 0 Unknown Error : 0 I've read that doing rx/tx tuning on the PRI is supposed to help, but nothing there seems to make a difference (I tuned RX down to -6.5 per the article here: http://www.voip-info.org/wiki/view/Asterisk+zapata+gain+adjustment so that the RX is at around 50%. I haven't found a good way to do TX tuning, as setting it via 'dahdi set swgain tx' doesn't seem to have any effect on the dahdi_monitor output). I've enabled fax debugging (fax set debug on), but that doesn't seem to do anything either (perhaps I need to raise asterisk's debug level as well?). What steps should I try next? Thanks in advance, -Justin
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