[Freeswitch-users] T.38 gateway and peer/self

Sat Feb 25 00:06:49 MSK 2017

If you have to switch to older free switch, that is a problem, we need to figure out exactly what is going on with current freeswitch or the issue will just never get fixed.

Please lets look at what happens when its running on latest 1.6 release not older release and figure out how to get that working properly.

> On Feb 24, 2017, at 3:46 PM, Peter Steinbach <lists at telefaks.de> wrote:
> 
> I finally found a solution, for those who are interested.
> I switched back to old Freeswitch from Feb 2016, as new FS always answered with 488 on T.38 reinvite from the B-Leg
> Then I implemented the following (coding outside of FS with XML-Curl)
> When call is done with T.38 on boths legs, do not anything special, just use a minimum dialplan
> if B-leg does not answer with T.38, this normally fails in my environment. I then store a Value NOT38 to the dialled number for 1/2 hour in a cache
> when then the fax machine is retrying the same call, I lookup the cache and return another dialplan with T38 gateway (self) enabled
> That way, pure T.38 calls work nicely, and calls with T.39 on the B-leg work on the second try.
> Hope this helps. At last here in Germany, we have to find some workarounds, as fax implementation on some carrier's side (to say the positive) does not improve.
> 
> Best regards
> Peter
> 
> 
> On 02/24/17 14:29, Peter Steinbach wrote:
>> Hello Brian,
>> 
>> I just updated to latest GIT. Dialplan ist still
>> 
>> Dialplan: sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> Action set(fax_enable_t38=true)
>> Dialplan: sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> Action set(fax_enable_t38_request=true)
>> Dialplan: sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> Action set(execute_on_answer=t38_gateway self)
>> Dialplan: sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> Action ring_ready()
>> Dialplan: sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> Action bridge(sofia/gateway/sip.provider.com/4940bbbbbbbbbbbbbbb at sip.provider.com) 
>> 
>> However the behavour changed now
>> 2017-02-24 13:50:18.913016 [NOTICE] switch_ivr_originate.c:3633 Channel [sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1>] has been answered
>> 2017-02-24 13:50:18.913016 [DEBUG] sofia.c:7241 Channel sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> entering state [completed][200]
>> EXECUTE sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> t38_gateway(peer)
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_core_media_bug.c:841 Attaching BUG to sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1>
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_channel.c:3780 (sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1>) Callstate Change RINGING -> ACTIVE
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_ivr_originate.c:3691 Originate Resulted in Success: [sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>]
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_ivr_bridge.c:1696 (sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>) State Change CS_CONSUME_MEDIA -> CS_EXCHANGE_MEDIA
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_core_state_machine.c:584 (sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>) Running State Change CS_EXCHANGE_MEDIA (Cur 2 Tot 10)
>> 2017-02-24 13:50:18.913016 [DEBUG] switch_core_state_machine.c:653 (sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>) State EXCHANGE_MEDIA
>> 2017-02-24 13:50:18.913016 [DEBUG] mod_sofia.c:645 SOFIA EXCHANGE_MEDIA
>> 2017-02-24 13:50:18.953025 [DEBUG] sofia.c:7241 Channel sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> entering state [ready][200]
>> 2017-02-24 13:50:18.953025 [DEBUG] switch_rtp.c:7021 Correct audio ip/port confirmed.
>> 2017-02-24 13:50:19.333126 [DEBUG] switch_rtp.c:7021 Correct audio ip/port confirmed.
>> 2017-02-24 13:50:19.333126 [DEBUG] switch_core_io.c:448 Setting BUG Codec PCMA:8
>> 2017-02-24 13:50:26.013047 [DEBUG] sofia.c:7241 Channel sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com> entering state [received][100]
>> 2017-02-24 13:50:26.013047 [DEBUG] sofia.c:7251 Remote SDP:
>> v=0
>> o=HuaweiSoftX3000 1487923856 1487923858 IN IP4 185.39.xx.yy
>> s=HuaweiSoftX3000
>> c=IN IP4 185.39.xx.yy
>> t=0 0
>> m=image 16762 udptl t38
>> a=T38FaxVersion:0
>> a=T38MaxBitRate:14400
>> a=T38FaxRateManagement:transferredTCF
>> a=T38FaxMaxBuffer:500
>> a=T38FaxMaxDatagram:500
>> a=T38FaxUdpEC:t38UDPRedundancy
>> 
>> 2017-02-24 13:50:26.013047 [DEBUG] switch_core_media.c:4634 sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com> T38 REFUSE on request
>> 2017-02-24 13:50:26.013047 [DEBUG] sofia.c:8152 Reinvite resulted in codec negotiation failure.
>> 2017-02-24 13:50:26.033201 [DEBUG] sofia.c:7234 Channel sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com> skipping state [ready][488]
>> 2017-02-24 13:50:31.993164 [DEBUG] mod_spandsp_fax.c:2212 Fax Tone Detected. [peer][]
>> 2017-02-24 13:50:31.993164 [DEBUG] mod_spandsp_fax.c:2080 sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1> starting gateway mode to sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>
>> 2017-02-24 13:50:31.993164 [DEBUG] mod_spandsp_fax.c:2098 (sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1>) State Change CS_EXECUTE -> CS_RESET
>> 2017-02-24 13:50:31.993164 [DEBUG] mod_spandsp_fax.c:2101 (sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com>) State Change CS_EXCHANGE_MEDIA -> CS_RESET
>> 2017-02-24 13:50:31.993164 [DEBUG] switch_core_media_bug.c:1208 Removing BUG from sofia/internalvpn2/492927aaaaaa at 10.7.0.1 <mailto:sofia/internalvpn2/492927aaaaaa at 10.7.0.1>
>> 2017-02-24 13:50:31.993164 [DEBUG] switch_ivr_bridge.c:792 sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com <mailto:sofia/external/4940bbbbbbbbbbbbbbb at sip.provider.com> ending bridge by request from write function
>> 
>> In this case the sip provider comes back with T.38 reinvite and Freeswitch refuses it.
>> 
>> As you mentioned that there are further settings and variables (I see e.g. "fax_t38_tx_reinvite_packet_count" in the release notes), I am wondering how I will neeed to set this up in order to have in one single dialplan:
>> send fax to SIP Provider(b leg) and have T.38 Re-invite from SIP Provider and pass it to a-leg
>> send fax to SIP Provider(b leg), do NOT receive T.38 Re-invite from SIP Provider and then do T.38 Gateway in FS.
>> 
>> Best regards Peter
>> 
>> 
>> On 02/24/17 08:52, Peter Steinbach wrote:
>>> Hello Brian,
>>> 
>>> this Version of Freeswitch is from 09-Feb-2016. So I think, we should update.
>>> 
>>> We need to cover 2 scenarios
>>> send fax to SIP Provider(b leg) and have T.38 Re-invite from SIP Provider and pass it to a-leg
>>> send fax to SIP Provider(b leg), do NOT receive T.38 Re-invite from SIP Provider and then do T.38 Gateway in FS.
>>> And no: We cannot foresee, whether the SIp provider will do T.38 and not. Here in Germany, the main incumbant PSTN provider did not implement T.38, so it depends on the target number and actual route, if this will be T.38 or not. A call to a certain number can be T.38 today and tomorrow it will be T.30 only, as some peering partner changed the routes in the meantime.
>>> 
>>> Best regards
>>> Peter
>>> 
>>> 
>>> On 02/23/17 20:38, Brian West wrote:
>>>> What revision of FreeSWITCH are you on?  These behaviors have been solidified in 1.6.15, Sadly MOST of the details of how it all works is locked up in my head, I've just not had the time to write it all down and update the documentation.  Can you outline all the scenarios you need to cover and if you have the ability know ahead of time which one needs to apply?
>>>> 
>>>> /b
>>>> 
>>>> 
>>>> On Thu, Feb 23, 2017 at 8:23 AM, Peter Steinbach <lists at telefaks.de <mailto:lists at telefaks.de>> wrote:
>>>> Hello,
>>>> 
>>>> we have the following screnario
>>>> The caller, a local fax machine (Fax, ATA and Freeswitch) with T.38, is behind a slow line so therefore T.38 is needed here
>>>> a central Freeswitch fax server serves as a central gateway to the SIP provider
>>>> the SIP provider sometimes reinvites T.38 and sometimes not.
>>>> In case, the SIP provider does NOT answer with T.38, the central Freeswitch fax server shall act as a T.38 gateway and transcode between local fax (T.38) and SIP provider (T.30)
>>>> In case, the SIP provider does answer with T.38, the central Freeswitch fax server shall pass T.38 to the local fax ,machine (T.38)
>>>> How we set this up
>>>> according to the wiki we have a dialplan as follows: (this is what CLI shows)
>>>> Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1 <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action set(fax_enable_t38=true)
>>>> Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1 <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action set(fax_enable_t38_request=true)
>>>> Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1 <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action set(execute_on_answer=t38_gateway self)
>>>> Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1 <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action ring_ready()
>>>> Dialplan: sofia/internalvpn2/49274xxxxx at 10.7.0.1 <mailto:sofia/internalvpn2/49274xxxxx at 10.7.0.1> Action bridge(sofia/gateway/sip.provider.com/xxxxxxxxxxxxxxx at sip.provider.com <mailto:sofia/gateway/sip.provider.com/xxxxxxxxxxxxxxx at sip.provider.com>)
>>>> 
>>>> In all profiles, we have
>>>> <param name="t38-passthru" value="true"/>
>>>> In case, the SIP provider does NOT answer with T.38, it works. The caller's side is reinvited with T.38, the SIP provider side is T.30
>>>> What the problem is: When the SIP provider' side IS answering with T.38, then (sometimes, when I send it via cli from the local freeswitch near the sending fax machine, it works)
>>>> caller initiates a call
>>>> call is bridged to the SIP provider' side
>>>> we receive a T.38 Reinvite from the SIP provider' side
>>>> Freeswitch sends Trying back to the the SIP provider' side
>>>> Freeswitch logs: set(execute_on_answer=t38_gateway self)
>>>> Freeswitch sends a T.38 Reinvite to the caller, establishes T.38 on this side.
>>>> But the T.38 Reinvite from the SIP provider' side is not answerered
>>>> So the SIP provider' sidehangs up after 10 sec of timeout.
>>>> What are we doing wrong here? Is it possible to act as a t.38 passthrough router and a T.38 gateway in the same dialplan?
>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> With kind regards
>>>> Peter Steinbach 
>>>> 
>>>> Telefaks Services GmbH
>>>> mailto:lists <mailto:lists> (att) telefaks.de <http://telefaks.de/>
>>>> Internet: www.telefaks.de <http://www.telefaks.de/>
>>>> 
>>>> 
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org <mailto:consulting at freeswitch.org>
>>>> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com/>
>>>> 
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org <http://www.freeswitch.org/>
>>>> http://confluence.freeswitch.org <http://confluence.freeswitch.org/>
>>>> http://www.cluecon.com <http://www.cluecon.com/>
>>>> 
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>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> Brian West
>>>> brian at freeswitch.org <mailto:brian at freeswitch.org>
>>>> Twitter: @FreeSWITCH , @briankwest
>>>> 
>>>> http://www.freeswitchbook.com <http://www.freeswitchbook.com/> 
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>>>> 
>>>> Allison prompts for FreeSWITCH:
>>>> 
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>>>> Wish to schedule a meeting?
>>>> 
>>>> http://app.timebridge.com/#/meet/freeswitch <http://app.timebridge.com/#/meet/freeswitch>
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>>>> T:+19184209001 | F:+19184209002 | M:+1918424WEST (9378)
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>>>> 
>>>> 
>>>> 
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services: 
>>>> consulting at freeswitch.org <mailto:consulting at freeswitch.org>
>>>> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com/>
>>>> 
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>>>> http://www.freeswitch.org <http://www.freeswitch.org/>
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>>>> 
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>>> 
>>> -- 
>>> With kind regards
>>> Peter Steinbach 
>>> 
>>> Telefaks Services GmbH
>>> mailto:lists <mailto:lists> (att) telefaks.de
>>> Internet: www.telefaks.de <http://www.telefaks.de/>
>>> 
>>> 
>>> 
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services: 
>>> consulting at freeswitch.org <mailto:consulting at freeswitch.org>
>>> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com/>
>>> 
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org <http://www.freeswitch.org/>
>>> http://confluence.freeswitch.org <http://confluence.freeswitch.org/>
>>> http://www.cluecon.com <http://www.cluecon.com/>
>>> 
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>> 
>> -- 
>> With kind regards
>> Peter Steinbach 
>> 
>> Telefaks Services GmbH
>> mailto:lists <mailto:lists> (att) telefaks.de
>> Internet: www.telefaks.de <http://www.telefaks.de/>
>> 
>> 
>> 
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services: 
>> consulting at freeswitch.org <mailto:consulting at freeswitch.org>
>> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com/>
>> 
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org <http://www.freeswitch.org/>
>> http://confluence.freeswitch.org <http://confluence.freeswitch.org/>
>> http://www.cluecon.com <http://www.cluecon.com/>
>> 
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> 
> -- 
> With kind regards
> Peter Steinbach 
> 
> Telefaks Services GmbH
> mailto:lists <mailto:lists> (att) telefaks.de
> Internet: www.telefaks.de <http://www.telefaks.de/>
> 
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services: 
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
> 
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
> 
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