Re: [MMUSIC] BUNDLE TEXT: Answerer Procedures (29th May)

["Cullen Jennings (fluffy)" <[e-mail]>]

Looks good to me

On May 29, 2013, at 5:39 AM, Christer Holmberg <[e-mail]> wrote:

> Hi,
>  
> Based on the e-mail and interim discussions, I’ve tried together some ”Answerer Procedures” text for BUNDLE.
>  
> For now, I would request that people mainly focus on the technical stuff, and if some text is unclear. I WILL align the usage of “m=” line and “media description” :)
>  
> Also note that examples will be added later.
>  
> Regards,
>  
> Christer
>  
> -----------------------------------------------------
>  
>  
> 6.4.  Answerer Procedures
>  
> 6.4.1.  General
>  
>    This section describes how an Answerer, when it receives an SDP Offer
>    including a BUNDLE group, generates the associated SDP Answer.
>  
>    When an Answerer receives an SDP Offer which includes a BUNDLE group,
>    and the Answerer accepts the offered BUNDLE group, the Answerer MUST
>    generate an SDP Answer according to the procedures in Section 6.1 and
>    this section.
>  
> 6.4.2.  RFC 5888 restrictions
>  
>    Based on the rules and procedures in RFC 5888, the following
>    restrictions also apply to BUNDLE groups in SDP Answers:
>  
>    o  1) A BUNDLE group must not be added to an SDP Answer, unless the
>       same BUNDLE group was included in the associated SDP Offer; and
>  
>    o  2) An SDP "m=" line must not be added to a BUNDLE group in the SDP
>       Answer, unless it in the associated SDP Offer was included in the
>       same BUNDLE group.
>  
> 6.4.3.  Offerer Bundle Address Selection
>  
>    In the SDP Answer, the Answerer selects the bundle address for the
>    Offerer, based on the address information received in the associated
>    SDP Offer, using the mid value.  The mid value associated with the
>    "m=" line in the SDP Offer that represents the bundle address MUST in
>    the SDP Answer be located first in the mid value list added to SDP
>    group:BUNDLE attribute associated with the BUNDLE group.
>  
>    From the associated SDP Offer, the Answerer SHOULD choose the bundle
>    address associated with the mid value located first in the mid value
>    list included in the SDP group:BUNDLE attribute associated with the
>    BUNDLE group, unless:
>  
>    o  1) The mid value represents an "m=" line with a port zero value in
>       the SDP Offer; or
>  
>    o  2) The mid value represents an "m=" line with a port zero value in
>       the SDP Answer.
>  
>    OPEN: The decision for allowing a media description with port zero
>    values inside a BUNDLE group is pending on update for RFC 5888.
>  
> 6.4.4.  Answerer Bundle Address Selection
>  
>    In the SDP Answer, the Answerer selects its local bundle address.
>    Each "m=" line included in a BUNDLE group MUST contain identical
>    address information.  The only exception is the usage of a zero port
>    value for an "m=" line, which is allowed eventhough another port
>    value number is used for other "m=" lines in the BUNDLE group.
>  
>    OPEN: The decision for allowing a media description with port zero
>    values inside a BUNDLE group is pending on update for RFC 5888.
>  
>    In a subsequent SDP Answer, the Answerer MAY change its local bundle
>    address, as long as each "m=" line included the BUNDLE group contain
>    identical address information.
>  
>    For a given BUNDLE group, the Answerer MUST NOT assign the bundle
>    address to "m=" lines that are not included the BUNDLE group, or to
>    "m=" lines that are included in another BUNDLE group.
>  
> 6.4.5.  Rejecting A BUNDLE Media Description
>  
>    When generating the SDP Answer, if the Answerer wants to reject media
>    associated with an "m=" line in the BUNDLE group, it will add a zero
>    port number value to the "m=" line, according to the procedures
>    defined in RFC 3264.
>  
>    OPEN ISSUE: It is FFS whether it is allowed to include a port zero
>    media descriptions in a BUNDLE group.
>  
> 6.4.6.  Removing a media description from a BUNDLE group
>  
>    When generating the SDP Answer, if the Answerer wants to remove an
>    "m=" line from a BUNDLE group (without rejecting the "m=" line),it
>    MUST NOT include the "m=" line in a BUNDLE group.  In addition, the
>    SDP Answer MUST not add its local bundle address to the "m=" line.
>  
>    An Answerer MUST NOT, in the SDP Answer, remove an "m=" line from a
>    BUNDLE group, unless the "m=" line had unique address information in
>    the associated SDP Offer.
>  
>    NOTE: The reason for the restriction above is that, if the "m=" line
>    would be removed from the BUNDLE group, the address information would
>    be identical to the "m=" lines remaining in the BUNDLE group.
>  
>    OPEN: The decision for allowing a media description with port zero
>    values inside a BUNDLE group is pending on update for RFC 5888.
>  
>  
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