[AVT] draft-ietf-avt-app-rtp-keepalive-01

Hi

I have some comments on draft-ietf-avt-app-rtp-keepalive-01. I found
the document very useful, many thanks for writing this!

Section 4.8 describes the RTP Packet with unknown payload type. It should
be added some text describing how the RTP header fields should be handled.
For example marker bit, sequence number, timestamp. My guess is that the
sequence number is incremented by one for each packet sent. What about
timestamp? Should it be incremented for each packet sent? Since we are
sending 0 bytes of payload, which value should it be increment by.

NITS:

6.  Additional considerations

    The agent SHOULD only send RTP keepalive when it does not send
    regular RTP paquets.
                ^^^^^^^

-> typo: should be "packets"

7.  Security Considerations

    The keepalive packets are sent on the same path as regular RTP media
    packets.  In addition, they do not convey any valuable information.
    So the mechanism described here doest not imply new security issues.
                                    ^^^^^

-> typo: should be "does"

/alfred

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