[Freeswitch-users] [solved] Ignore INFO DTMF

[Mitja Thomas]

Hello Leon & Avi,

@Leon: sadly that didnt do the trick. dtmf_info=true was already set in 
sip_profile, so setting it again as a channel variable didnt help. As 
far as I understand it (which is admittedly not very well): Although the 
FreeSWITCH is set to accept DTMF_INFO dtmf tones, dtmf gets disabled 
because the Snom phone does not send the right rtp media attribute 
(a=rtpmap 101 telephone-event/8000) in SIP Invite.

Anyhow the liberal-dtmf option (suggested by Avi) solved this problem. 
FS did behave well... liberal and thats exactly what we needed.
Thanks a lot to both of you!

Regards
Mitja

> Hello Mitja,
>
> I've been looking through that bit of code as well the last few days 
> as we're having problems with a host that negotiates no 
> telephone-event, but wants it anyway.
>
> But for your case, if you want to force SIP INFO, isn't it good enough 
> to just set a channel variable dtmf_info=true on the channel towards 
> your snom phones ?
>
> regards,
>
> Leon
>
>
>
> On Aug 23, 2011, at 10:02 AM, Mitja Thomas wrote:
>
>> Hi,
>>
>> we are experiencing problems with DTMF between Snom Sip Phones and 
>> FS. The DMTF Type is set to SIP INFO (sip info only on Snom Phones). 
>> We could nail it down to a missing "telephone-event" parameter in sip 
>> sdp:
>> INVITE sip:***6 at spklw.x;user:phone SIP/2.0
>> Via: SIP/2.0/UDP ip:5060;branch=z9hG4bK-15eyqwai33r1;rport
>> From: "Test" <sip:8000 at spklw.x>;tag=qqnbrunjmq
>> To: <sip:***6 at spklw.x;user:phone>
>> Call-ID: 3c33e6c729b3-t9yol2613q6v
>> CSeq: 1 INVITE
>> Max-Forwards: 70
>> Contact: <sip:8000 at ip:5060;line=9lwqdnrx>;reg-id=1
>> X-Serialnumber: 000413262C33
>> P-Key-Flags: resolution="31x13", keys="4"
>> User-Agent: snom370/8.4.32
>> Accept: application/sdp
>> Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, 
>> PRACK, MESSAGE, INFO, UPDATE
>> Allow-Events: talk, hold, refer, call-info
>> Supported: timer, 100rel, replaces, from-change
>> Session-Expires: 3600;refresher=uas
>> Min-SE: 90
>> Content-Type: application/sdp
>> Content-Length: 244
>>
>> v=0
>> o=root 334284706 334284706 IN IP4 phoneip
>> s=call
>> c=IN IP4 phoneip
>> t=0 0
>> m=audio 12610 RTP/AVP 8 9
>> a=direction:both
>> a=rtpmap:8 PCMA/8000
>> a=rtpmap:9 G722/8000
>> a:ptime:20
>> a=rtcp-xr:stat-summary=loss,dup,jitt
>> a=sendrecv
>>
>> That resulted in sofia_glue.c disabling DTMF. A slight change in 
>> sofia_glue.c (Line 4839 in commit 
>> 71964f61ac4817ecfc516edaf4b643f41236868d) did the trick for us:
>> if (tech_pvt->dtmf_type == DTMF_INFO) { //EWETEL
>> } else {                                //EWETEL
>>                 
>> switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), 
>> SWITCH_LOG_DEBUG, "Disable 2833 dtmf\n");
>>                 switch_channel_set_variable(tech_pvt->channel, 
>> "dtmf_type", "none");
>>                 tech_pvt->dtmf_type = DTMF_NONE;
>>                 te = tech_pvt->recv_te = 0;
>> } //EWETEL
>>
>> Now the question is:
>> Is this a too restrictive behaviour in FS or a shortcoming from the 
>> Snom phones (which would mean we have to submit a bug, wait, wait, 
>> wait and then hopefully someday it gets fixed :) )?
>>
>> Regards,
>> Mitja
>>
>> -- 
>> Mitja Thomas
>> Vertrieb Geschäftskunden
>>
>> Branchenlösungen / Service Entwicklung
>>
>> Telefon: 	+49 (0) 441 -  8000-4916
>> E-Mail: 	mitja.thomas at ewe.de
>>
>>
>> EWE TEL GmbH
>> Cloppenburger Straße 310
>> 26133 Oldenburg
>> E-Mail:info at ewe.de
>> Internet:www.ewe.de
>>
>> Handelsregister Amtsgericht Oldenburg HRB 3723
>> Vorsitzender des Aufsichtsrates: Dr. Werner Brinker
>> Geschäftsführung: Konrad Meier (Vorsitzender), Dirk Brameier, Ulf Heggenberger, Norbert Westfal
>>
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>


-- 
Mitja Thomas
Vertrieb Geschäftskunden

Branchenlösungen / Service Entwicklung

Telefon: 	+49 (0) 441 -  8000-4916
E-Mail: 	mitja.thomas at ewe.de


EWE TEL GmbH
Cloppenburger Straße 310
26133 Oldenburg
E-Mail: info at ewe.de
Internet: www.ewe.de

Handelsregister Amtsgericht Oldenburg HRB 3723
Vorsitzender des Aufsichtsrates: Dr. Werner Brinker
Geschäftsführung: Konrad Meier (Vorsitzender), Dirk Brameier, Ulf Heggenberger, Norbert Westfal


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