[VoiceOps] T38 over Sip

[Junaid Hattia]

We are only experiencing problems when trying to send multi page faxes, when
sending single page faxes it completes successfully.

Please see the attached sniffer traces, they include calls with both single
page and multipage faxes over T.38 with ecm disabled and the G711ulaw

It would seem that no data is transmitted after the MPS message

Pleasee see below the fax configuration


voice service voip 
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none
sip
!
!
voice class codec 1
codec preference 1 g711ulaw

dial-peer voice 1 voip
description sip fax test
translation-profile outgoing voip
destination-pattern 0T
voice-class codec 1
session protocol sipv2
session target ipv4:192.168.0.14
incoming called-number 0873514633
fax-relay ecm disable
fax protocol t38 nse force ls-redundancy 0 hs-redundancy 0 fallback
pass-through g711ulaw
!
dial-peer voice 2 pots
tone ringback alert-no-PI
destination-pattern 0873514633
direct-inward-dial
port 6/0:D
forward-digits all
!


Looking at the trace I'm concerned about the t38:t30- No-signal messages


On 2009/08/28 6:13 PM, "Lee Riemer" <lriemer at bestline.net> wrote:

> Next time you include a capture, don't include your telnet session where we
> can see you log in.  A simple "port 5060" when you start the capture will
> prevent this.
> 
> Anyways, if you don't see something like this:
> 
> m=image 16002 udptl t38
> a=T38FaxVersion:0
> a=T38FaxRateManagement:transferredTCF
> a=T38FaxFillBitRemoval:0
> a=T38FaxTranscodingMMR:0
> a=T38FaxTranscodingJBIG:0
> a=T38MaxBitRate:14400
> a=T38FaxUdpEC:t38UDPFEC
> a=T38FaxMaxBuffer:200
> a=T38FaxMaxDatagram:72
> 
> in the SDP section, T38 is not attempting to kick in.
> 
> Lee Riemer - Director IP Voice
> Bestline Communications, L.P.
> 512.328.9095 Voice
> 512.328.0038 Fax
> 
> Junaid Hattia wrote:
>>  
>> So basically I cannot fax...attached is the wireshark trace
>> 
>> 
>> On 2009/08/28 1:29 PM, "Alex Balashov" <abalashov at evaristesys.com>
>> <mailto:abalashov at evaristesys.com>  wrote:
>> 
>>   
>>  
>>>  
>>> There are many things that could be wrong there.  Problem description is
>>> not sufficient.
>>> 
>>> Junaid Hattia wrote:
>>> 
>>>     
>>>  
>>>>  
>>>> Howdy
>>>> 
>>>> Ok so im trying to t38 over sip working with no luck
>>>> 
>>>> My test lab is as follows:
>>>> 
>>>> Pangea box connecting to a AS5400 via PRI, which then traverses an Acme
>>>> Session director, broadsoft and then exits via PGW(SS7)
>>>> 
>>>> The sniffer capture says ³failure to train²
>>>> 
>>>> 
>>>> Any ideas?
>>>> 
>>>> --
>>>>  junaid
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
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