Bandwidth parameter in SIP/SDP

 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 ellen.robins <at> team.telstra.com 

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