Not Able to parse SIP INFO

Asterisk Asterisk Support
1

Hai,
I am using asterisk 1.6.1.1. I enabled dtmfmode=info in sip configuration. When i am sending dtmf from one user to another am getting 415 unsupported. Can any one give any suggestion.

Sip Messgae :
<— SIP read from UDP://10.0.0150:5063 —>
INFO sip:671234@10.0.0.0.209 SIP/2.0
Via: SIP/2.0/UDP 10.0.0.19:5063;branch=z9hG4bK1613545940
From: sip:671235@10.0.0.19:5063;tag=697161631
To: “671234” sip:671234@10.0.0.209;tag=as66861f16
Call-ID: 2deace7b02b21efd35ce14552c1599c2@192.168.0.209
CSeq: 104 INFO
Contact: sip:671234@10.0.0.19:5063
Content-Type: audio/telephone-event
Max-Forwards: 70
User-Agent: Yealink
Content-Length: 4


<------------->
— (11 headers 1 lines) —
Receiving INFO!
[Dec 18 14:42:28] WARNING[22665]: chan_sip.c:15036 handle_request_info: Unable to parse INFO message from 2deace7b02b21efd35ce14552c1599c2@10.0.0.209. Content |���

<— Transmitting (no NAT) to 10.0.0.19:5063 —>
SIP/2.0 415 Unsupported media type
Via: SIP/2.0/UDP 10.0.0.19:5063;branch=z9hG4bK1613545940;received=10.0.0.19
From: sip:671235@10.0.0.19:5063;tag=697161631
To: “671234” sip:671234@10.0.0.209;tag=as66861f16
Call-ID: 2deace7b02b21efd35ce14552c1599c2@10.0.0.209
CSeq: 104 INFO
Server: Asterisk PBX 1.6.1.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 0

Thanks And Regards

Andrew

2

Asterisk (at least for 1.6.1.0, does not support audio/telephone-event, in INFO.

It only supports:

application/dtmf-relay
application/vnd.nortelnetworks.digits
application/dtmf
application/media_control+xml

In practaice rfc2833 (the actual RFC for this has been superceded) is the current best practice.

3

Hai,

I checked with asterisk 1.8.9.2 version. But the issue is remains same.

Which asterisk version it will work ??

Thanks And Regards

Andrew

4

Probably none, as INFO is a dead end technology for DTMF.

At least some Yealink models seem to support the rfc2833 setting, which is the preferred choice.

5

Hai David,

Thanks for the reply.

So it seems like asterisk cannot support DTMF in INFO method rite.

It will work only INBAND and RFC2833. I tested these two DTMFs and it is working for me.

Thanks And Regards

Andrew

6

Asterisk can support four different ways of using DTMF in info. It cannot support the fifth way that your phone uses. I suspect that DTMF in INFO was never standardised.