[hylafax-users] Unspecified Phase C error

Hello,

Hylafax (version 4.1.3) functions very well on my server and the modems are in class 2.0

but however from time to time some remote fax cannot connected

and in the file log (/var/log/messages)

the message is as follows

"unspecified Phase C error, including too much delay between TCF and +FDR command"

and in log of Hylafax the message is

Jun 05 13:48:33.72: [17177]: RECV: begin page

Jun 05 13:48:33.72: [17177]: RECV: send trigger 022

Jun 05 13:48:33.72: [17177]: <-- data [1]

Jun 05 13:48:34.77: [17177]: RECV: 0 total lines, 0 bad lines, 0 consecutive bad lines

Jun 05 13:48:34.77: [17177]: --> [14:+FPS:1,1,0,0,0]

Jun 05 13:48:37.16: [17177]: --> [5:ERROR]

Jun 05 13:48:37.16: [17177]: MODEM Command error

Jun 05 13:48:37.16: [17177]: REMOTE HANGUP: Unspecified Phase C error, including too much delay between TCF and +FDR command (code 90)

Jun 05 13:48:37.16: [17177]: RECV FAX (00005584): recvq/fax04430.tif from 0558467722, route to <unspecified>, 0 pages in 0:17

Jun 05 13:48:37.16: [17177]: RECV FAX: Unspecified Phase C error, including too much delay between TCF and +FDR command

Jun 05 13:48:37.16: [17177]: <-- [7:AT+FKS\r]

Jun 05 13:48:37.40: [17177]: --> [2:OK]

this log is continuation renegotiation speed length of page etc...

I consulted a technical document on the fax modem (PROGRAMER' S TECHNICAL REFERENCE DATA AND FAX COMMUNICATION of ROBERT L HUMMEL)

it is known as +FPS the Answer is sent from the fax modem to the DCE at the end of phase C data reception to report the status of page transfer

Application SP-2388-B Class 2.0

I tested an identical modem (U.S.ROBOTICS 56k FAXMODEM) with probemodem class 2.0 in response of AT+FPS=? of them it answers (1-5) and AT+FPS? 1 (default) that seems to correspond to +FPTS command class 1 whereas AT+FPS is ppr, lc, blc, cblc, lbc

according to the man of hylafax-config

the Class2PTSCmd command in Class 2 is +FPTS and CLass2PTSCmd command in Class 2.0 is +FPS

the Class2PTSCmd command is by default +FPS

Question: Does Hylafax use which Command? I think that it is Class 2.0
is what the modem returns the good response to the test

I acknowledge that I do not understand?

somebody can it help me

Yves