Subject: [MMUSIC] FW: [Sip] Bandwidth parameter in SIP/SDP

From: "Robins, Ellen" <[email-masked]>
Date: Mon, 6 Aug 2007 13:57:57 +1000

-----Original Message-----
From: James M. Polk [mailto:[email-masked]]
Sent: Wednesday, 1 August 2007 4:59 AM
To: Robins, Ellen
Subject: Re: [Sip] Bandwidth parameter in SIP/SDP

this question is on the wrong list. Try posting to the MMUSIC WG

At 12:42 AM 7/31/2007, you wrote:
>  Dear all,
>Please help to confirm which bandwidth parameter shall be used by Video

>Terminal Client for a SIP Client to SIP Client call case, i.e. between
>2 parties not a three-way conference.
>
>    Bandwidth
>
>    b=<modifier>:<bandwidth-value>
>
>    o This specifies the proposed bandwidth to be used by the session
or
>      media, and is optional.
>
>    o <bandwidth-value> is in kilobits per second
>
>    o <modifier> is a single alphanumeric word giving the meaning of
the
>      bandwidth figure.
>
>    o Two modifiers are initially defined:
>
>    CT Conference Total: An implicit maximum bandwidth is associated
with
>      each TTL on the Mbone or within a particular multicast
>      administrative scope region (the Mbone bandwidth vs. TTL limits
are
>      given in the MBone FAQ). If the bandwidth of a session or media
in
>      a session is different from the bandwidth implicit from the
scope,
>      a `b=CT:...' line should be supplied for the session giving the
>      proposed upper limit to the bandwidth used. The primary purpose
of
>      this is to give an approximate idea as to whether two or more
>      conferences can co-exist simultaneously.
>
>    AS Application-Specific Maximum: The bandwidth is interpreted to be
>      application-specific, i.e., will be the application's concept of
>      maximum bandwidth.  Normally this will coincide with what is set
on
>      the application's "maximum bandwidth" control if applicable.
>
>      Note that CT gives a total bandwidth figure for all the media at
>      all sites.  AS gives a bandwidth figure for a single media at a
>      single site, although there may be many sites sending
>      simultaneously.
>
>
>Thanks and kind regards / Ellen Robins
>ViG Technology Manager
>Services Enablers
>Wireless Engineering & Operations
>Telstra Operations
>Telstra Corporation Limited
>
>Ph 03 8627 8981
>Mob 0428 309 250
>Fax 03 9620 7864
>Mail [email-masked]
>
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