Conference State Control Protocol CSCP

1
Conference State Control Protocol(CSCP)

• IETF 62 - XCON WG
• Cullen Jennings

2
The problem

• Checking we agree on
• There is a bunch of state that has to do with how
  things get mixed
• For different conference system this is different
• We need a common way to change it
• New systems will define new state, and old
  clients need to be able to manipulate that state
  too

3
The Semantics We Need

• Read/Write/Add/Delete
• Add/Delete require some understanding of what the
  objects are
• Read/Write will have better GUI if one
  understands but usable with no understanding
• Assumption
• The Data Schemas will be defined to conceptually
  represent the data with the flavor du jour, which
  is XML

4
Transactions

• 2-phase commits are hard
• We dont need them
• Lets not add them
• There are places where many changes need to be
  made.
• The Pipeline approach significantly speeds up
  these bulk changes without adding much to
  complexity

5
The Syntax

• Could be EBCDIC over CORBA (not my first
  choice). Could be SOAP over BEEP, SNMP, Netconf,
  XCAP, ACAP, WebDAV, HTML Forms, COPS-PR, SOAP,
  XML-RPC, SIP-T, ONC-RPC, RMI, .NET bindings or
  the ever popular INFO method
• For different environments, different solutions
  have advantages, and I would somewhat expect to
  see us end more than one way to manipulate the
  state

6
So Why BFCP?

• For devices that use BFCP, it turns out doing
  this with something similar to BFCP works fairly
  well for more or less the same reasons
• If we disagree with these reasons, we should
  reconsider BFCP
• under 100ms round trip response - change volume
  hear it change
• Small footprint
• Small messages
• We already have to do BFCP

7
Summary

• The Data model is important
• The semantics of manipulating it are important
• how to name what is being manipulated
• what manipulations are possible
• the transaction model
• error reporting and recovery
• how a server can extend the data and still be
  used by a client that was not extended
• This work about the syntax is far less important