Re: [Sip-implementors] DTMF digits dupplicate issue

[Paul Kyzivat]

On 10/24/16 8:19 PM, Kapila wrote:

On Tue, Oct 25, 2016 at 2:04 AM, Dale R. Worley  wrote:


Kapila  writes:

Is it allowed to transmit dtmf in inband audio as well as in dynamic
payload type ?


As far as I know, it is valid to send DTMF in-band as well as
telephone-events events.  Of course, the two should match, and the
recipient should trust the telephone-events and discard the in-band
DTMF.

Dale


Thanks Dale. I couldn't find any reference to say that it is not allowed to
send the DTMF digit as an event and the same digit in-band.

However, most endpoints seems to interpret the received digits incorrectly
because we had number of different UAs read digit twice.

So, this goes to implementation specific bin. Our only workaround at this
moment is to disable telephone-events payload on peers.


Are you the sender, or the receiver that is having trouble?

If both are being sent, then presumably they both carry the same 
timestamp. ISTM that in such a case a receiver would only want to render 
sample for a given timestamp.


If you are the sender, then I think you would want to take the wise 
course of only sending one or the other. If telephone events have been 
negotiated, then they would be seem to be the preferred choice.


Thanks,
Paul

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Re: [Sip-implementors] DTMF digits dupplicate issue

[Kapila]

On Tue, Oct 25, 2016 at 2:04 AM, Dale R. Worley  wrote:

> Kapila  writes:
> > Is it allowed to transmit dtmf in inband audio as well as in dynamic
> > payload type ?
>
> As far as I know, it is valid to send DTMF in-band as well as
> telephone-events events.  Of course, the two should match, and the
> recipient should trust the telephone-events and discard the in-band
> DTMF.
>
> Dale
>
Thanks Dale. I couldn't find any reference to say that it is not allowed to
send the DTMF digit as an event and the same digit in-band.

However, most endpoints seems to interpret the received digits incorrectly
because we had number of different UAs read digit twice.

So, this goes to implementation specific bin. Our only workaround at this
moment is to disable telephone-events payload on peers.

Kapila
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Re: [Sip-implementors] DTMF digits dupplicate issue

[Dale R. Worley]

Kapila  writes:
> Is it allowed to transmit dtmf in inband audio as well as in dynamic
> payload type ?

As far as I know, it is valid to send DTMF in-band as well as
telephone-events events.  Of course, the two should match, and the
recipient should trust the telephone-events and discard the in-band
DTMF.

Dale
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Re: [Sip-implementors] DTMF digits dupplicate issue

[Swarner, John A.]

If you negotiate for dtmf events, you cannot also expect to receive in band 
tones. Here's the wording from the RFC 4733:

If the sender receives an "events" parameter from the
   receiver, it MUST restrict the set of events it sends to those listed
   in the received "events" parameter.

They go on to give an example in the RFC if  you need more information:

https://tools.ietf.org/html/rfc4733


-Original Message-
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Anh Cao
Sent: Sunday, October 23, 2016 9:14 PM
To: 'My Gmail' <dheerajmaho...@gmail.com>; 'Kapila' <kapila.kap...@gmail.com>
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] DTMF digits dupplicate issue

Hi,

There is any standard/RFC for this?
Because my system only accept telephone-event packet and drop all in-band DTMF 
when I use SDP as below and I'm not sure it is correct.

Thanks,
Anh

-Original Message-
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of My Gmail
Sent: Saturday, October 22, 2016 11:23 AM
To: Kapila <kapila.kap...@gmail.com>
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] DTMF digits dupplicate issue

Yes, its fine. The message mention indicates that both party support both 
codecs. Pcmu can  be used for both audio and dtmf and 101 only for dtmf. 

Thanks and Regards
Dheeraj Kumar 

Sent from iPhone

> On 22-Oct-2016, at 9:02 AM, Kapila <kapila.kap...@gmail.com> wrote:
> 
> Hi all,
> 
> Is it allowed to transmit dtmf in inband audio as well as in dynamic 
> payload type ?
> 
> in a recent deployment, we've noticed that Vendor X device sends the 
> dtmf in such way.
> The call scenario is a simple call that SDPs offers are,
> 
> UAC: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> UAS: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> Thanks
> Kapila
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Re: [Sip-implementors] DTMF digits dupplicate issue

[Anh Cao]

Hi,

There is any standard/RFC for this?
Because my system only accept telephone-event packet and drop all in-band
DTMF when I use SDP as below and I'm not sure it is correct.

Thanks,
Anh

-Original Message-
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of My
Gmail
Sent: Saturday, October 22, 2016 11:23 AM
To: Kapila <kapila.kap...@gmail.com>
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] DTMF digits dupplicate issue

Yes, its fine. The message mention indicates that both party support both
codecs. Pcmu can  be used for both audio and dtmf and 101 only for dtmf. 

Thanks and Regards
Dheeraj Kumar 

Sent from iPhone

> On 22-Oct-2016, at 9:02 AM, Kapila <kapila.kap...@gmail.com> wrote:
> 
> Hi all,
> 
> Is it allowed to transmit dtmf in inband audio as well as in dynamic 
> payload type ?
> 
> in a recent deployment, we've noticed that Vendor X device sends the 
> dtmf in such way.
> The call scenario is a simple call that SDPs offers are,
> 
> UAC: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> UAS: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> Thanks
> Kapila
> ___
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> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
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Re: [Sip-implementors] DTMF digits dupplicate issue

[My Gmail]

Yes, its fine. The message mention indicates that both party support both 
codecs. Pcmu can  be used for both audio and dtmf and 101 only for dtmf. 

Thanks and Regards 
Dheeraj Kumar 

Sent from iPhone

> On 22-Oct-2016, at 9:02 AM, Kapila  wrote:
> 
> Hi all,
> 
> Is it allowed to transmit dtmf in inband audio as well as in dynamic
> payload type ?
> 
> in a recent deployment, we've noticed that Vendor X device sends the dtmf
> in such way.
> The call scenario is a simple call that SDPs offers are,
> 
> UAC: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> UAS: Media Attribute (a): rtpmap:0 PCMU/8000,  Media Attribute (a):
> rtpmap:101 telephone-event/8000
> 
> 
> Thanks
> Kapila
> ___
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> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
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