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Richard.Lamkin at mett...
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 Posted: Thu Apr 23, 2009 10:11 am Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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I have looked on the wiki and only found passing reference to RFC 4733 in the SRTP section.
RFC4733 = RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals.
This obsoletes RFC2833.
http://www.ietf.org/rfc/rfc4733.txt
Richard Lamkin
Mettoni Group UK
richard.lamkin@mettoni.com (richard.lamkin@mettoni.com)
************************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. http://www.mettoni.com Mettoni Ltd Registered in England and Wales: 4485956 9400 Garsington Road, Oxford Business Park, Oxford, OX4 2HN ************************************************************************* |
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brian at freeswitch.org
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mike at jerris.com
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| Posted: Thu Apr 23, 2009 10:15 am Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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rfc 4733 attempts (and fails miserably) to clarify rfc2833. It doesn't "really" change anything of any real substnace. Our handling of these packets tries very hard to be strict in what we send and loose in what we accept and we tend to interoperate pretty well with most endpoints. That being said, there are some very broken endpoints out there (such as sonus) that require special hacks, some are automatic, some require settings. All that being said, we should be very compliant with both 2833 and 4733, although you will generally see references in settings refer to 2833.
Mike
On Apr 23, 2009, at 10:50 AM, Richard Lamkin wrote:
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steveu at coppice.org
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| Posted: Thu Apr 23, 2009 10:32 am Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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Michael Jerris wrote:
| Quote: | rfc 4733 attempts (and fails miserably) to clarify rfc2833. It
doesn't "really" change anything of any real substnace. Our handling
of these packets tries very hard to be strict in what we send and
loose in what we accept and we tend to interoperate pretty well with
most endpoints. That being said, there are some very broken endpoints
out there (such as sonus) that require special hacks, some are
automatic, some require settings. All that being said, we should be
very compliant with both 2833 and 4733, although you will generally
see references in settings refer to 2833.
|
RFC4733 largely tries to clarify RFC2833 for the DTMF features. However,
for most other signal it is very incompatible with RFC2833.
Steve
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mike at jerris.com
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| Posted: Thu Apr 23, 2009 10:55 am Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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I should clarify that we support the dtmf tones plus flash but no
other tones at this time.
Mike
On Apr 23, 2009, at 11:17 AM, Steve Underwood wrote:
| Quote: | Michael Jerris wrote:
| Quote: | rfc 4733 attempts (and fails miserably) to clarify rfc2833. It
doesn't "really" change anything of any real substnace. Our handling
of these packets tries very hard to be strict in what we send and
loose in what we accept and we tend to interoperate pretty well with
most endpoints. That being said, there are some very broken
endpoints
out there (such as sonus) that require special hacks, some are
automatic, some require settings. All that being said, we should be
very compliant with both 2833 and 4733, although you will generally
see references in settings refer to 2833.
|
RFC4733 largely tries to clarify RFC2833 for the DTMF features.
However,
for most other signal it is very incompatible with RFC2833.
|
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Freeswitch-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
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achaloyan at yahoo.com
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| Posted: Thu Apr 23, 2009 2:07 pm Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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| Quote: | I should clarify that we support the dtmf tones plus flash but no other tones at this time.
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Seems you have not to support other tones, because they are declared as deprecated in RFC4733 (See also a companion RFC4734). Flash is deprecated either, however supporting flash ensures backward compatibility. Anyway it's used only by a few gateways.
RFC 2833 caused me a lot of headaches in the past, there were 13 drafts over 2833, if I'm not mistaken, before they finally published 4733.
It indeed contains some clarifications, while it's mostly backward compatible with 2833.
The most ridiculous part in out of band implementation is robustness against network conditions and interference of in-band and out-of-band tones (SIP -> PSTN) , surely not counting robustness against broken implementations (from Asterisk 1.2 times).
Anyway, section "2.5.2.2. Playout of Tone Events in RFC4733" deserves careful reading.
Regards,
Arsen.
Date: Thu, 23 Apr 2009 11:48:39 -0400
From: Michael Jerris <mike@jerris.com (mike@jerris.com)>
Subject: Re: [Freeswitch-users] Is RFC 4733 supported ?
To: freeswitch-users@lists.freeswitch.org (freeswitch-users@lists.freeswitch.org)
Message-ID: <909FF661-266E-47D1-A881-52D54C99ACCB@jerris.com (909FF661-266E-47D1-A881-52D54C99ACCB@jerris.com)>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I should clarify that we support the dtmf tones plus flash but no
other tones at this time.
Mike
On Apr 23, 2009, at 11:17 AM, Steve Underwood wrote:
| Quote: | Michael Jerris wrote:
| Quote: | rfc 4733 attempts (and fails miserably) to clarify rfc2833. It
doesn't "really" change anything of any real substnace. Our handling
of these packets tries very hard to be strict in what we send and
loose in what we accept and we tend to interoperate pretty well with
most endpoints. That being said, there are some very broken
endpoints
out there (such as sonus) that require special hacks, some are
automatic, some require settings. All that being said, we should be
very compliant with both 2833 and 4733, although you will generally
see references in settings refer to 2833.
|
RFC4733 largely tries to clarify RFC2833 for the DTMF features.
However,
for most other signal it is very incompatible with RFC2833.
|
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Richard.Lamkin at mett...
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| Posted: Fri Apr 24, 2009 5:30 am Post subject: [Freeswitch-users] Is RFC 4733 supported ? |
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Thank you all for your contributions to this thread.
If I understood correctly.
All DTMF signals defined in RFC4733 are supported, and similarly they are supported to RFC2833. There are other signals defined in RFC4733 that are not implemented.
The note from Michael “strict in what we send and loose in what we accept” is a useful clarification.
Regards
Richard Lamkin
Mettoni Group
richard.lamkin@mettoni.com (richard.lamkin@mettoni.com)
From: Arsen Chaloyan [mailto:achaloyan@yahoo.com]
Sent: 23 April 2009 19:50
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] Is RFC 4733 supported ?
| Quote: | I should clarify that we support the dtmf tones plus flash but no other tones at this time.
|
Seems you have not to support other tones, because they are declared as deprecated in RFC4733 (See also a companion RFC4734). Flash is deprecated either, however supporting flash ensures backward compatibility. Anyway it's used only by a few gateways.
RFC 2833 caused me a lot of headaches in the past, there were 13 drafts over 2833, if I'm not mistaken, before they finally published 4733.
It indeed contains some clarifications, while it's mostly backward compatible with 2833.
The most ridiculous part in out of band implementation is robustness against network conditions and interference of in-band and out-of-band tones (SIP -> PSTN) , surely not counting robustness against broken implementations (from Asterisk 1.2 times).
Anyway, section "2.5.2.2. Playout of Tone Events in RFC4733" deserves careful reading.
Regards,
Arsen.
Date: Thu, 23 Apr 2009 11:48:39 -0400
From: Michael Jerris <mike@jerris.com (mike@jerris.com)>
Subject: Re: [Freeswitch-users] Is RFC 4733 supported ?
To: freeswitch-users@lists.freeswitch.org (freeswitch-users@lists.freeswitch.org)
Message-ID: <909FF661-266E-47D1-A881-52D54C99ACCB@jerris.com (909FF661-266E-47D1-A881-52D54C99ACCB@jerris.com)>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I should clarify that we support the dtmf tones plus flash but no
other tones at this time.
Mike
On Apr 23, 2009, at 11:17 AM, Steve Underwood wrote:
| Quote: | Michael Jerris wrote:
| Quote: | rfc 4733 attempts (and fails miserably) to clarify rfc2833. It
doesn't "really" change anything of any real substnace. Our handling
of these packets tries very hard to be strict in what we send and
loose in what we accept and we tend to interoperate pretty well with
most endpoints. That being said, there are some very broken
endpoints
out there (such as sonus) that require special hacks, some are
automatic, some require settings. All that being said, we should be
very compliant with both 2833 and 4733, although you will generally
see references in settings refer to 2833.
|
RFC4733 largely tries to clarify RFC2833 for the DTMF features.
However,
for most other signal it is very incompatible with RFC2833.
|
************************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. http://www.mettoni.com Mettoni Ltd Registered in England and Wales: 4485956 9400 Garsington Road, Oxford Business Park, Oxford, OX4 2HN ************************************************************************* |
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