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BLP

Sent following a unmatched SYN's response. A value of 'AL' indicates that all Messenger users who are not on the Block List are allowed to see the client's online status and start a chat session with the client. A value of 'BL' indicates that these users will see the client as offline and will not be allowed to start a chat session.

BLP setting

• setting: A string value of either 'AL' or 'BL'

MSNP13

Starting with MSNP13, the BLP value must be retrieved using the Addressbook ABCH SOAP Service (as discussed on the MSNP13:Changes page). You can find the value by looking for the MSN.IM.BLP Annotation on the Me contact.

Once the value has been retrieved it must be published to the service:

BLP TrID setting

• setting: A string value of either 'AL' or 'BL'

See also: initial ADL