[Freeswitch-users] Ignore INFO DTMF

[Mitja Thomas]

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
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26133 Oldenburg
E-Mail: info at ewe.de
Internet: www.ewe.de

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