msnp-wiki/docs/versions/cvr0.md

Introduction

CVR0 is a subprotocol of the Mobile Status Notification Protocol. It was introduced officially in Client Version 1.0.0863, along with MSNP2.

It is used for requesting the latest client information in case no other protocols were supported.

Command information

It introduces the commands:

• CVQ

No error codes were known to be introduced in this version

No commands were known to be removed in this version

Known changes

(from Beta 2):

• Changed CVR to CVQ
• CVQ: Added fallback URL to response (parameter 5)
• [MSNP8 and higher]: Added current principle address to request (parameter 8)

Client-server communication examples

Older protocols

• MSNP2-MSNP7, example using Client Version 1.0.

C: VER 1 MSNP2 CVR0
S: VER 1 CVR0
C: CVQ 2 0x0409 win 4.10 i386 MSMSGS 1.0.0863
S: CVQ 2 5.0.0537 5.0.0537 1.0.0863 http://download.microsoft.com/download/msnmessenger/install/5.0/w98nt42kmexp/en-us/setupdl.exe http://messenger.microsoft.com

Server disconnects client.

Newer protocols

• MSNP8 and higher, example using Client Version 6.1.

C: VER 1 MSNP10 MSNP9 CVR0
S: VER 1 CVR0
C: CVQ 2 0x0409 winnt 5.1 i386 MSNMSGR 6.1.0211 MSMSGS example@passport.com
S: CVQ 2 7.0.0813 7.0.0813 6.2.0205 http://msgr.dlservice.microsoft.com/download/5/d/9/5d9bb5b2-49c7-4890-94ab-d1d5e44a0e6d/Install_MSN_Messenger.exe http://messenger.msn.com

Server disconnects client.