Re: [AVTCORE] [payload] Erratas on RFC 4867 (The AMR RTP Payload Format)

정경훈 <> Tue, 21 July 2015 23:28 UTC

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Subject: Re: [AVTCORE] [payload] Erratas on RFC 4867 (The AMR RTP Payload Format)
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Samsung Enterprise Portal mySingle

Hi Magnus


Indeed, it has been a long time since RFC 4867 was released but real

implementations based on this RFC got deployed only recently (around 2012)

in a large scale over commercial, especially mobile, IP networks where

interoperability issues cannot be ignored.


We believe it is necessary to clarify the sentences on the usage of CMR

as proposed in the errata.


Best regards,

Kyunghun Jung

Samsung Electronics Co., Ltd.


------- Original Message -------

Sender : Magnus Westerlund<>

Date : 2015-07-22 01:07 (GMT+09:00)

Title : [payload] Erratas on RFC 4867 (The AMR RTP Payload Format)



There has been three erratas submitted toward RFC 4867 the AMR RTP
payload format:

The numbers for the Erratas are 4347, 4348, and 4349.

I am one of the co-authors and I want to resolve these erratas. I am
sending this to both AVTCORE and PAYLOAD WG due to that the erratas
arriving on AVTCORE's mailing list, but is more in PAYLOAD's scope. So
please keep both lists in the reply. Any judgment of the consensus will
be done by Roni Even.

They are all related to text regarding the usage of the Codec Mode
Request field. Unclarities and contradictions in the RFC has caused
interoperability problems. These have been discussed in 3GPP SA4 and
they have discussed and agreed on this proposal for addressing these

The proposed changes can be seen in the errata as well as the
motivations. I have produced a side-by-side diff for the text changes
which is attached to make it easier to see what is proposed to be
changed in the text.

From my perspective these erratas should be VERIFIED. The reason is
that the changes proposed appear to be enforcing what I can remember
being the intention of the document, but being more easier to understand
and without the conflict. However, there has been substantial amount of
time since this was specified and people may have other views. Thus, I
really like to see if someone disagree with that the erratas encode the
intention and therefore should not be VERIFIED.

It would be good if people could provide any feedback no later than the
22nd of August.


Magnus Westerlund

Services, Media and Network features, Ericsson Research EAB/TXM
Ericsson AB                 | Phone  +46 10 7148287
Farogatan 6                 | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto:
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