Re: [hylafax-users] T.38 / T.30 handshake problems

["Atis Lezdins" <atis@xxxxxxxxxxx>]

On Sat, Aug 9, 2008 at 9:53 PM, Lee Howard <faxguy@xxxxxxxxxxxxxxxx> wrote:
> Atis Lezdins wrote:
>>
>> On Mon, Aug 4, 2008 at 4:59 PM, Lee Howard <faxguy@xxxxxxxxxxxxxxxx>
>> wrote:
>>
>>>
>>> Atis Lezdins wrote:
>>>
>>>>
>>>> Jul 31 10:45:58.60: [ 3884]: ANSWER: FAX CONNECTION  DEVICE
>>>> '/dev/ttyIAX1'
>>>> Jul 31 10:45:58.60: [ 3884]: STATE CHANGE: ANSWERING -> RECEIVING
>>>> Jul 31 10:45:58.60: [ 3884]: RECV FAX: begin
>>>> Jul 31 10:45:58.60: [ 3884]: <-- HDLC<32:FF C0 04 B5 00 AA 12 9E 36 86
>>>> 62 82 1A 04 14 2E B6 94 04 6A A6 4E CE 96 F6 76 04 AC 74 4C 74 4C>
>>>> Jul 31 10:45:58.60: [ 3884]: <-- data [32]
>>>> Jul 31 10:45:58.60: [ 3884]: <-- data [2]
>>>> Jul 31 10:45:59.56: [ 3884]: --> [7:CONNECT]
>>>> Jul 31 10:45:59.56: [ 3884]: <-- HDLC<23:FF C0 02 B6 A6 26 F6 B6 1A 82
>>>> 92 04 04 04 04 04 04 04 04 04 04 04 04>
>>>> Jul 31 10:45:59.56: [ 3884]: <-- data [23]
>>>> Jul 31 10:45:59.56: [ 3884]: <-- data [2]
>>>> Jul 31 10:46:00.30: [ 3884]: --> [7:CONNECT]
>>>> Jul 31 10:46:00.30: [ 3884]: <-- HDLC<13:FF C8 01 00 73 5F 23 01 FB C1
>>>> 01
>>>> 01 18>
>>>> Jul 31 10:46:00.30: [ 3884]: <-- data [13]
>>>> Jul 31 10:46:00.30: [ 3884]: <-- data [2]
>>>> Jul 31 10:46:00.88: [ 3884]: --> [2:OK]
>>>> Jul 31 10:46:00.88: [ 3884]: <-- [9:AT+FRH=3\r]
>>>> Jul 31 10:46:01.20: [ 3884]: --> [7:CONNECT]
>>>> Jul 31 10:46:04.48: [ 3884]: --> [10:NO CARRIER]
>>>>
>>>
>>> At this point the IAXmodem record feature would be extremely useful.  I
>>> trust that you're running IAXmodem on the PSTN and through your VoIP
>>> provider?
>>>
>>
>> Ok, i did a capture of similar unsuccessful fax call. As i understand
>> -dsp and -iax correspond to incoming/outgoing audio? It seems that at
>> this point audio goes both ways.
>>
>> The connection is like this:
>>
>> Hylafax <-> IAXmodem <-> Asterisk <-> PRI <-> PSTN <-> VoIP provider
>> <-> T38modem <-> Asterisk <-> Hylafax
>>
>> The first side - Hylafax/IAXmodem/Asterisk/PRI works fine, but we want
>> to migrate to pure VoIP and use T.38 instead, so we are testing this.
>
> I don't know what the problem is, but it's something to do with the sender.
>  It raises V.21 but never sends anything but flags... no HDLC data is
> delivered, no TSI signal, no DCS signal, and certainly no TCF signal.
>
> Something is either wrong wit hthe T.38 gateway or the sender.

Well, the sender is HylaFAX, and i don't see any DCS sent in it's logs
(can be seen in my first mail). It's just timing out.. If i would know
what it's waiting for, i could debug T38modem more..

Regards,
Atis

-- 
Atis Lezdins,
VoIP Project Manager / Developer,
atis@xxxxxxxxxxx
Skype: atis.lezdins
Cell Phone: +371 28806004
Cell Phone: +1 800 7300689
Work phone: +1 800 7502835


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