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Courier modem receive problem



We have run Hylafax (v4.0pl2, Sparc-Solaris-2.6, gcc-2.8.1)
successfully for many years with a Multitech MT1932ZDX modem.  In
order to accomodate a new telephone arrangement which put incoming
faxes on a distinctive-ring, we switched to a USR Courier V.everything
modem.  The USR modem is new, with supervisor rev. 7.2.1, DSP rev
2.2.7.  It is configured with the default configuration, except that I
did

	ATS70=8&W

to write the register command directing the modem to answer only on
Ring D into the modem's NVRAM.  I configured the modem on device cua/a
with the stock Hylafax USR-2.0 configuration.

With this configuration, the modem answers incoming calls on the
distinctive ring, goes off hook, and syncs a carrier.  But with
occasional exceptions, we get no further.  Here is a typical log entry
of an incoming fax call on the distinctive ring:

Dec 21 07:56:26.90: [12835]: SESSION BEGIN 00002399 14013314578
Dec 21 07:56:26.90: [12835]: <-- [4:ATA\r]
Dec 21 07:56:32.93: [12835]: --> [4:+FCO]
Dec 21 07:56:32.93: [12835]: ANSWER: FAX CONNECTION
Dec 21 07:56:32.93: [12835]: RECV FAX: begin
Dec 21 07:57:06.67: [12835]: --> [7:+FHS:01]
Dec 21 07:57:06.67: [12835]: REMOTE HANGUP: Ring detect without successful handshake (code 1)
Dec 21 07:57:06.67: [12835]: --> [2:OK]
Dec 21 07:57:06.67: [12835]: RECV FAX: Ring detect without successful handshake
Dec 21 07:57:06.71: [12835]: RECV FAX: end
Dec 21 07:57:06.71: [12835]: SESSION END

For comparison, here is a log entry for one of the very occasional
successful receive connections:

Dec 20 09:50:15.80: [ 9346]: SESSION BEGIN 00002359 14013314578
Dec 20 09:50:15.80: [ 9346]: <-- [4:ATA\r]
Dec 20 09:50:21.75: [ 9346]: --> [4:+FCO]
Dec 20 09:50:21.75: [ 9346]: ANSWER: FAX CONNECTION
Dec 20 09:50:21.75: [ 9346]: RECV FAX: begin
Dec 20 09:50:23.41: [ 9346]: --> [27:+FTI:"          2129830529"]
Dec 20 09:50:23.41: [ 9346]: REMOTE TSI "2129830529"
Dec 20 09:50:23.76: [ 9346]: --> [20:+FCS:0,5,0,2,0,0,0,1]
Dec 20 09:50:23.76: [ 9346]: REMOTE wants 14400 bit/s
Dec 20 09:50:23.76: [ 9346]: REMOTE wants page width 1728 pixels in 215 mm
Dec 20 09:50:23.76: [ 9346]: REMOTE wants unlimited page length 
Dec 20 09:50:23.76: [ 9346]: REMOTE wants 3.85 line/mm
Dec 20 09:50:23.76: [ 9346]: REMOTE wants 1-D MR
Dec 20 09:50:23.76: [ 9346]: --> [2:OK]
Dec 20 09:50:23.77: [ 9346]: <-- [7:AT+FDR\r]
Dec 20 09:50:27.14: [ 9346]: --> [20:+FCS:0,5,0,2,0,0,0,1]
Dec 20 09:50:27.14: [ 9346]: REMOTE wants 14400 bit/s
Dec 20 09:50:27.14: [ 9346]: REMOTE wants page width 1728 pixels in 215 mm
Dec 20 09:50:27.14: [ 9346]: REMOTE wants unlimited page length 
Dec 20 09:50:27.14: [ 9346]: REMOTE wants 3.85 line/mm
Dec 20 09:50:27.14: [ 9346]: REMOTE wants 1-D MR
Dec 20 09:50:28.95: [ 9346]: --> [7:CONNECT]
Dec 20 09:50:28.95: [ 9346]: RECV: begin page
Dec 20 09:50:28.95: [ 9346]: RECV: send trigger 022
Dec 20 09:50:28.95: [ 9346]: <-- data [1]
Dec 20 09:51:05.27: [ 9346]: RECV: 1068 total lines, 0 bad lines, 1 consecutive bad lines
Dec 20 09:51:05.27: [ 9346]: --> [17:+FPS:1,1078,0,0,0]
Dec 20 09:51:09.51: [ 9346]: --> [6:+FET:2]
Dec 20 09:51:09.51: [ 9346]: RECV recv EOP (no more pages or documents)
Dec 20 09:51:09.51: [ 9346]: --> [2:OK]
Dec 20 09:51:09.51: [ 9346]: RECV send MCF (message confirmation)
Dec 20 09:51:09.51: [ 9346]: RECV FAX (00002359): from 2129830529, page 1 in 0:46, INF, 3.85 line/mm, 1-D MR
Dec 20 09:51:09.52: [ 9346]: RECV FAX (00002359): recvq/fax01147.tif from 2129830529, route to <unspecified>, 1 pages in 0:48
Dec 20 09:51:09.52: [ 9346]: <-- [7:AT+FDR\r]
Dec 20 09:51:12.46: [ 9346]: --> [7:+FHS:00]
Dec 20 09:51:12.46: [ 9346]: REMOTE HANGUP: Normal and proper end of connection (code 0)
Dec 20 09:51:12.46: [ 9346]: RECV FAX: bin/faxrcvd "recvq/fax01147.tif" "cua_a" "00002359" ""
Dec 20 09:51:14.63: [ 9346]: RECV FAX: end
Dec 20 09:51:14.63: [ 9346]: SESSION END


After so many years of successful operation with the Multitech modem,
I'm stumped.  I've searched the mailing list archives, the HylaFaq,
and alta-vista, and have found nothing like this.

I'd very much appreciate suggestions of how to get this modem to
receive faxes reliably here: additional debugging procedures,
configuration files, modem configuration changes, even suggestions
that a different fax modem would be more reliable for fax reception on
a distinctive ring line.

Thank you in advance for your attention,

-- 

Ronald Florence			http://members.home.net/18james



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