spa2102 and t38 fax speed 2400-4800

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Oct 19th, 2009
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Today the fax speed of 2400 and 4800 are not supported in T38 on spa2102 and other cisco-linksys-sipura products.


The sad think is that dhey are not able to fallback to g711 when a couterpart is hardlocked at those speed.

So in that case we have 100% failure rate.


When do you plan to fix the issue?


regards

Rosario

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Alberto Montilla Tue, 10/20/2009 - 10:21
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Hi Rosario;


Please give me some time to check with engineering on this subject.


Regards
Alberto

Alberto Montilla Mon, 10/26/2009 - 04:37
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Dear Sir;


Checked with engineering. It is not possible to fallback to G.711 after T.38 negotiation is successful (which is the case). It seems the best workaround that is possible at this stage is to enable those speeds on the fax machine, it should not hurt fax operation.


Regards
Alberto

rpingar Mon, 10/26/2009 - 04:49
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no, you didn't get the case.


The ata are not able to fully negotiate the 2400 and 4800 speed in T38 because no one SPA or WRP400 support the T38 at those speed.


The comunication start but no succesfull negotiation (all this beacuse spa2102 doesn't support 2400 or 4800 in T38 mode).

This is the log:

2009-10-23 16:38:01 Local3.Debug 93.88.97.193 [1]FM 00018130 Tx      T38: i.no_signal
2009-10-23 16:38:01 Local3.Debug 93.88.97.193 [1]FM 00018690 Rx      T38: i.v21_preamble
2009-10-23 16:38:02 Local3.Debug 93.88.97.193 [1]FM 00019670 Rx      T38: d.v21 . . .
2009-10-23 16:38:03 Local3.Debug 93.88.97.193 [1]FM 00020280 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:03 Local1.Debug 93.88.97.193 [1]FM 00020320 Mod TSI Frame [25]:  ff 03 43 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 91 96
2009-10-23 16:38:03 Local3.Debug 93.88.97.193 [1]FM 00020430 Rx      T38: d.v21 . . .
2009-10-23 16:38:03 Local3.Debug 93.88.97.193 [1]FM 00020660 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:03 Local1.Debug 93.88.97.193 [1]FM 00020750     DCS: 0.1.0.2.0.0.0.2  v27_4800
2009-10-23 16:38:03 Local1.Debug 93.88.97.193 [1]FM 00020750 Mod DCS Frame [11]:  ff 13 83 00 8a a8 80 80 00 35 f3
2009-10-23 16:38:04 Local3.Debug 93.88.97.193 [1]FM 00020890 Rx      T38: d.hdlc_sig_end
2009-10-23 16:38:04 Local3.Debug 93.88.97.193 [1]FM 00020900 Rx      T38: i.no_signal
2009-10-23 16:38:04 Local3.Debug 93.88.97.193 [1]FM 00021080 Rx      T38: i.v27_4800_training
2009-10-23 16:38:04 Local1.Debug 93.88.97.193 [1]FM 00021110 Mod     Modulation v27_4800_training
2009-10-23 16:38:05 Local3.Debug 93.88.97.193 [1]FM 00021940 Rx      T38: d.v27_4800 . . .
2009-10-23 16:38:06 Local3.Debug 93.88.97.193 [1]FM 00023410 Rx      T38: d.t4_non_ecm_sig_end
2009-10-23 16:38:06 Local3.Debug 93.88.97.193 [1]FM 00023420 Rx      T38: i.no_signal
2009-10-23 16:38:09 Local3.Debug 93.88.97.193 [1]FM 00026410 Tx      T38: i.v21_preamble
2009-10-23 16:38:09 Local3.Debug 93.88.97.193 [1]FM 00026430 Tx      T38: i.no_signal
2009-10-23 16:38:12 Local3.Debug 93.88.97.193 [1]FM 00029390 Rx      T38: i.v21_preamble
2009-10-23 16:38:13 Local3.Debug 93.88.97.193 [1]FM 00030380 Rx      T38: d.v21 . . .
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00030990 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:14 Local1.Debug 93.88.97.193 [1]FM 00031020 Mod TSI Frame [25]:  ff 03 43 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 91 96
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00031150 Rx      T38: d.v21 . . .
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00031380 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:14 Local1.Debug 93.88.97.193 [1]FM 00031450     DCS: 0.1.0.2.0.0.0.2  v27_4800
2009-10-23 16:38:14 Local1.Debug 93.88.97.193 [1]FM 00031450 Mod DCS Frame [11]:  ff 13 83 00 8a a8 80 80 00 35 f3
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00031590 Rx      T38: d.hdlc_sig_end
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00031600 Rx      T38: i.no_signal
2009-10-23 16:38:14 Local3.Debug 93.88.97.193 [1]FM 00031830 Rx      T38: i.v27_4800_training
2009-10-23 16:38:14 Local1.Debug 93.88.97.193 [1]FM 00031860 Mod     Modulation v27_4800_training
2009-10-23 16:38:15 Local3.Debug 93.88.97.193 [1]FM 00032620 Rx      T38: d.v27_4800 . . .
2009-10-23 16:38:17 Local3.Debug 93.88.97.193 [1]FM 00034110 Rx      T38: d.t4_non_ecm_sig_end
2009-10-23 16:38:17 Local3.Debug 93.88.97.193 [1]FM 00034120 Rx      T38: i.no_signal
2009-10-23 16:38:20 Local3.Debug 93.88.97.193 [1]FM 00037110 Tx      T38: i.v21_preamble
2009-10-23 16:38:20 Local3.Debug 93.88.97.193 [1]FM 00037130 Tx      T38: i.no_signal
2009-10-23 16:38:23 Local3.Debug 93.88.97.193 [1]FM 00040060 Rx      T38: i.v21_preamble
2009-10-23 16:38:24 Local3.Debug 93.88.97.193 [1]FM 00041060 Rx      T38: d.v21 . . .
2009-10-23 16:38:24 Local3.Debug 93.88.97.193 [1]FM 00041680 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:24 Local1.Debug 93.88.97.193 [1]FM 00041700 Mod TSI Frame [25]:  ff 03 43 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 91 96
2009-10-23 16:38:24 Local3.Debug 93.88.97.193 [1]FM 00041800 Rx      T38: d.v21 . . .
2009-10-23 16:38:25 Local3.Debug 93.88.97.193 [1]FM 00042040 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:25 Local1.Debug 93.88.97.193 [1]FM 00042110     DCS: 0.1.0.2.0.0.0.2  v27_4800
2009-10-23 16:38:25 Local1.Debug 93.88.97.193 [1]FM 00042110 Mod DCS Frame [11]:  ff 13 83 00 8a a8 80 80 00 35 f3
2009-10-23 16:38:25 Local3.Debug 93.88.97.193 [1]FM 00042250 Rx      T38: d.hdlc_sig_end
2009-10-23 16:38:25 Local3.Debug 93.88.97.193 [1]FM 00042260 Rx      T38: i.no_signal
2009-10-23 16:38:25 Local3.Debug 93.88.97.193 [1]FM 00042480 Rx      T38: i.v27_4800_training
2009-10-23 16:38:25 Local1.Debug 93.88.97.193 [1]FM 00042510 Mod     Modulation v27_4800_training
2009-10-23 16:38:26 Local3.Debug 93.88.97.193 [1]FM 00043300 Rx      T38: d.v27_4800 . . .
2009-10-23 16:38:27 Local3.Debug 93.88.97.193 [1]FM 00044790 Rx      T38: d.t4_non_ecm_sig_end
2009-10-23 16:38:27 Local3.Debug 93.88.97.193 [1]FM 00044790 Rx      T38: i.no_signal
2009-10-23 16:38:30 Local3.Debug 93.88.97.193 [1]FM 00047770 Tx      T38: i.v21_preamble
2009-10-23 16:38:30 Local3.Debug 93.88.97.193 [1]FM 00047790 Tx      T38: i.no_signal
2009-10-23 16:38:33 Local3.Debug 93.88.97.193 [1]FM 00050720 Rx      T38: i.v21_preamble
2009-10-23 16:38:34 Local3.Debug 93.88.97.193 [1]FM 00051690 Rx      T38: d.v21 . . .
2009-10-23 16:38:34 Local3.Debug 93.88.97.193 [1]FM 00051780 Rx      T38: d.hdlc_fcs_OK
2009-10-23 16:38:34 Local1.Debug 93.88.97.193 [1]FM 00051810 Mod DCN Frame [ 5]:  ff 13 fb 9a f6
2009-10-23 16:38:35 Local3.Debug 93.88.97.193 [1]FM 00051950 Rx      T38: d.hdlc_sig_end
2009-10-23 16:38:35 Local3.Debug 93.88.97.193 [1]FM 00051960 Rx      T38: i.no_signal
2009-10-23 16:38:35 Local3.Debug 93.88.97.193 [1]FM 00052350 Tx      T38: i.v21_preamble
2009-10-23 16:38:35 Local2.Debug 93.88.97.193 CC:Ended
2009-10-23 16:38:35 Local3.Debug 93.88.97.193 FM Stop RxTx Forced
2009-10-23 16:38:35 Local2.Debug 93.88.97.193 T38: StopRx


Rosario

Alberto Montilla Sat, 10/31/2009 - 08:00
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  • Cisco Employee,

Hi Rosario;


Sorry for the delay. I'm checking with engineering.


Regards
Alberto

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