VPIM v3 Goals

1
VPIM v3 Goals

• VPIM Version 3 Workgroup
• 3 February 1999

2
VPIM v3 Goals

• The primary goal for this version is to support
  interoperability with desktop clients. Other
  goals include expanded interoperability with
  unified messaging systems, backward
  compatibility, and conformance to Internet
  standards. This presentation does not include
  goals that were met fully by VPIM version 2.

3
VPIM v3 Goals

• Interoperability
• Conformance to existing standards
• Backward compatibility
• Robustness

4
Interoperability

• Interoperability with desktop clients
• Interoperability with voice messaging systems
• Interoperability with unified messaging systems
• Interoperability with traditional email servers

5
Interoperability with desktop email applications

• Multiple codecs
• Availability on desktops
• Quantity
• Source code availability
• IP issues
• Decoding and encoding complexity
• Bit rate
• Voice Over IP support

6
Desktop Interoperability, cont.

• Audio encoding
• Streaming
• Text body parts
• Critical content
• Audio-incapable clients
• Discard rules

7
Interoperability with v2 and v3 voice messaging
systems

• Simple minimum set of required features
• Mechanism for identifying essential content
• Well-defined discard rules
• May require support of new status codes in v2

8
Interoperability with v3 unified messaging systems

• Non primary content
• Critical content
• Discard rules
• Embedding of VPIM messages

9
Interoperability with traditional email servers

• Interoperate consistently with current Internet
  mail environment
• Interoperate successfully with common user
  practices for mail messages
• storing messages in databases
• retransmission
• forwarding
• creation of mail digests
• replying to messages using non-audio equipment

10
Conformance to existing standards

• Restrictions
• The profile should impose as few restrictions as
  possible to existing Internet mail standards.
• It must support all elements of RFC 822 except
  those that prevent the profile from meeting other
  version 3 goals.

11
Conformance, cont.

• Additions
• The profile should make as few additions as
  possible to existing internet mail standards.
• It should adhere to existing desktop standards in
  desktop-related areas such as file extensions. If
  it is necessary to define new MIME types or
  sub-types, the VPIM version 3 work group should
  propose terms that are already standard or in
  common use in the desktop environment.

12
Backward compatibility

• Assure backward compatibility with VPIM version 2
• VPIM version 3 must comprise of superset of VPIM
  v2 features.
• It should also provide define a minimal set of
  rules and status codes for handling non-delivery
  of VPIM v3 messages.
• Where this is not possible, it may be necessary
  to clarify or revise version 2.

13
Robustness

• Assure usability in an environment in which there
  exist legacy gateways that do not understand
  MIME.
• Core features and critical data must not be lost
  when messages pass through AMIS gateways.
• Allow interoperability with recipient devices and
  gateways which have limited buffering
  capabilities.