03-05-2004 01:48 PM
Hello!
I tryed to send fax with T.38 through an as5300 gateway - IOS 12.2(5). The called fax equipment was a Panasonic KX-TM131 fax machine. I wasn't able to send fax - I tryed many-many times.
In Cisco I got:
2w0d: 0:D (20085) 37979490 fr-msg-det NSF
2w0d: 0:D (20085) 37980690 fr-msg-det CSI
2w0d: 0:D (20085) 37981430 fr-msg-det DIS
2w0d: 0:D (20085) 37983050 fr-msg-tx TSI
2w0d: 0:D (20085) 37983700 fr-msg-tx good crc, 23 bytes
2w0d: 0:D (20085) 37983780 fr-msg-tx DCS
2w0d: 0:D (20085) 37989110 fr-msg-det FTT
2w0d: 0:D (20085) 37990540 fr-msg-tx TSI
2w0d: 0:D (20085) 37991180 fr-msg-tx good crc, 23 bytes
2w0d: 0:D (20085) 37991260 fr-msg-tx DCS
2w0d: 0:D (20085) 37996590 fr-msg-det FTT
2w0d: 0:D (20085) 37998020 fr-msg-tx TSI
2w0d: 0:D (20085) 37998660 fr-msg-tx good crc, 23 bytes
2w0d: 0:D (20085) 37998740 fr-msg-tx DCS
2w0d: 0:D (20085) 38006550 fr-msg-tx DCN
On the sender's side I saw, that I didn't get AT+FRH=3 modem command - timeouted. The Cisco gateway DIDN'T send back anything to the sender while it had to. While the sender didn't get back response to FRH=3 (I think in 3 seconds) the line was dropped.
The same situation is time to time - the problem is reproducable. I did also packet sniff for T38 protocol and I saw, that no T38 response packet came from Cisco gateway.
I also tryed to send to the same fax machine with T.37 protocol. With T37 it worked fine:
2w0d: 0:D (20089) 35699126 fr-entered (10ms)
2w0d: 0:D (20089) 35699230 fr-pkt-loss 2
2w0d: 0:D (20089) 35705370 fr-msg-det NSF
2w0d: 0:D (20089) 35706570 fr-msg-det CSI
2w0d: 0:D (20089) 35707320 fr-msg-det DIS
2w0d: 0:D (20089) 35707940 fr-msg-tx TSI
2w0d: 0:D (20089) 35709210 fr-msg-tx DCS
2w0d: 0:D (20089) 35714830 fr-msg-det FTT
2w0d: 0:D (20089) 35715270 fr-msg-tx TSI
2w0d: 0:D (20089) 35716540 fr-msg-tx DCS
2w0d: 0:D (20089) 35722160 fr-msg-det FTT
2w0d: 0:D (20089) 35722610 fr-msg-tx TSI
2w0d: 0:D (20089) 35723880 fr-msg-tx DCS
2w0d: 0:D (20089) 35729500 fr-msg-det FTT
2w0d: 0:D (20089) 35729950 fr-msg-tx TSI
2w0d: 0:D (20089) 35731220 fr-msg-tx DCS
2w0d: 0:D (20089) 35736840 fr-msg-det CFR
2w0d: 0:D (20089) 35784290 fr-msg-tx EOP
2w0d: 0:D (20089) 35786920 fr-msg-det MCF
2w0d: 0:D (20089) 35787360 fr-msg-tx DCN
From this I think, the problem is with T.38 part (not with T.30).
I also tryed to send through an as5350 - IOS 12.2(15)T9 - with T.38 and got the same.
Could anybody help me?
Thanks in advance,
Thomas
03-11-2004 07:33 AM
Looks like a clock mismatch issue. Try configuring the command "clock source internal" on the gateways on both the ends.
03-16-2004 04:10 PM
I didn't expected much from changing 'clock source' because problems are ONLY with that destination/fax machine. All of the other destionations are good (I didn't hit a similar situation).
Even so I tryed to change the clock source. Unfortunately it didn't help.
My configuration was:
controller E1 0
clock source internal
pri-group timeslots 1-31
!
interface Serial0:15
no ip address
isdn switch-type primary-net5
isdn incoming-voice modem
isdn map address .* plan isdn type unknown
isdn T309-enable
isdn T321 40000
isdn T310 20000
isdn sending-complete
no fair-queue
no cdp enable
!
voice-port 0:D
cptone
bearer-cap Speech
!
dial-peer voice 300 voip
incoming called-number xxxT
voice-class codec 3
fax protocol t38 ls-redundancy 0 hs-redundancy 0
ip precedence 5
no vad
!
dial-peer voice 301 pots
destination-pattern xxxT
direct-inward-dial
port 0:D
prefix 0
!
voice class codec 3
codec preference 1 g729r8
codec preference 2 g729br8
codec preference 3 g723ar53
codec preference 4 g723ar63
codec preference 5 g723r53
codec preference 6 g723r63
codec preference 7 g711alaw
codec preference 8 g711ulaw
!
As I wrote, this configuration works well, just in this one case I have problems (maybe there are more cases just didn't sent enough faxes to find out).
Any help would be appreciated.
Thanks!
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