About -> Available Versions -> 4.0.x Releases -> Release 4.0.0

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1.  Migration from 3.6.x to 4.0.0

2.  What is new in 4.0.0

2.1  OpenSIPS Core

2.2  JSON module

• new $json_compact_noescape variable added

2.3  AAA_DIAMETER module

• A new parameter, max_json_log_size can be used to increase the size of printed JSONs in case of errors.

2.4  B2B_LOGIC module

• A new variable has been added $b2b_logic.peer that returns the peer of a given b2b_logic key, expressed as callid;from-tag;to-tag.

2.5  CALLOPS module

• The mi_call_hold and mi_call_unhold MI functions have been enhanced with two more parameters: leg that can specify which call to be put on hold, and headers that can be used to provide extra headers to the outgoing re-INVITE.

2.6  DIALOG module

• The load_dialog_ctx() function has been enhanced with a new parameter that allows filtering only active dialogs - that is dialogs that are not deleted, their state is lower than 5.

2.7  MI_DATAGRAM module

• A new parameter has been added socket_buf_size that can be used to tune the datagram buffer size - this can be useful when dealing with Unix Datagram Sockets communication, where buffer size is not limited to UDP size.