Current stable version is numbered 4.3.x and it was released in June 2015.

Previous version was 4.2.x (released on October 16, 2014), see what was new in that release at:

• http://www.kamailio.org/wiki/features/new-in-4.2.x

This is a draft of new features added in 4.3 version, manually updated, thus not always synchronized with what is new in source code repository.

• API-like shared key peer-to-peer authentication using SHA hashing
• http://kamailio.org/docs/modules/devel/modules/auth_xkeys.html

• distribute user location (usrloc) records between Kamailio servers using distributed message queue (dmq)
• http://kamailio.org/docs/modules/devel/modules/dmq_usrloc.html

• connector to Erlang node
• http://kamailio.org/docs/modules/devel/modules/erlang.html

• GeoIP API for configuration file using the new library with support for IPv6
• http://kamailio.org/docs/modules/devel/modules/geoip2.html

• JSON document management using Jansson library
• it has support for JSON-PATH
• http://kamailio.org/docs/modules/devel/modules/jansson.html

• JSON-RPC over netstrings client using Jansson library
• http://kamailio.org/docs/modules/devel/modules/janssonrpc-c.html

• enables sending data to the statsd framework directly from kamailio.cfg
• http://kamailio.org/docs/modules/devel/modules/statsd.html

• SIP routing based on JSON API
• http://kamailio.org/docs/modules/devel/modules/rtjson.html

• enables control of the TCP options (such as the keepalive mechanism), on demand, and on a per-socket basis
• http://kamailio.org/docs/modules/devel/modules/tcpops.html

• exported additional tm functions
  • sr.tm.t_load_contacts
  • sr.tm.t_next_contatcs
  • sr.tm.t_on_branch_failure

• added modparam radius_avps_mode parameter (int, true if not null)
• reading all RADIUS AV-pairs to kamailio avp (not only SIP-AVP, if radius_avps_mode set to true)

• added support for incoming and outgoing trunk-group AVPs
• new module parameter: workerq_length_threshold_percentage
• added custom AVP to transport Call-ID in diameter request
• added new counter(stat) for worker queue lenght - this will give an indication that workers are not keeping up with load if it gets too big

• added support for incoming and outgoing trunk-group AVPs

• rpc commands for gflags management

• added Redis support for distributed cnxcc nodes

• added parameter to change affected rows value for UPDATE queries
  • when enabled will return the number of matched/foudn rows as opposed to the number of updated rows

• new module parameters “timeout” and “tcp_keepalive”

• added affected rows capability

• option to add custom headers for local requests to callee

• added support for active and early dialog stats

• new RPC command: dialplan.dump
  • list all entries in the dialplan

• support $(avp(“key”)[+]) notation on dynamic match/subst rules:
  • ^(00|\+)?$(avp(s:pbx_cli)[+])([0-9]{3})$ will check every value of $(avp(s:pbx_cli) in the match one by one.
  • See https://github.com/kamailio/kamailio/issues/5 for more details
• option to allow variables in match and substitution expressions - new parameter: match_dynamic to enable this feature

• new function ds_list_exist() to check if a dispatcher set exists
• added per gateway and global send socket configuration

• added realtime DB support for Ro sessions
• added support for trunk ID in Ro CCR

• new module param use_preferred_scscf_uri - allows ICSCF to have a preferred S-CSCF is HSS returns a list

• use separate process to manage reginfo subscribes and publishes
• new pseude-variable to get username of Contact that was used during registration

• use dedicated process to send notifies
• new parameter user_data_always - if set S-CSCF always requests user data from HSS
• new mod_param subscription_expires_range - if set this parameter randomises the subscription expiry
• new parameter notification_list_size_threshold
• new function term_impu_has_contact - use this function to check if an IMPU has a valid contact

• Rx_reg - use received IP for framed_ip_address AVP
• Rx_AAR - new parameters that let you set sub-id and sub-id-type
• new parameter cdp_event_list_size_threshold

• added new parameter to contact match using only URI host and port

• added database support for subscriptions
• callback when contact is deleted/removed

• support to receive RPC commands via FIFO file

• add append_sdp_oldmediaip parameter

• Redis authentication is now supported:

modparam("ndb_redis", "server", "name=srvX;addr=127.0.0.2;port=6379;db=4;pass=mypassword")

• take in consideration number of cpus for load

• configurable matching criteria to remove subscriptions from memory
• added min_expires parameter
• added min_expires_action parameter - action to take when min_expires > 0, possible values are:
  • 1 - RC compliant, return “423 Interval Too Brief”
  • 2 - force min_expires in the subscription

• added outbound_proxy for publishing info
• new parameter db_table_lock_write: enable (=1) or disable (=0) the locks for table during an transaction

• load dialogs for dialoginfo event upon restart
• store pubruri for caller and callee in dlg vars

• new variable type: $vn() that can hold a $NULL value. The existing $var() can not have a $NULL value.
  • similar to $var(name) and able to hold $null
  • default value is $null

$vn(x) = 0; $vn(x) = “abc”; $vn(x) = $null;

• $vz(name) aliased to $var(name)
• $sut - new variable that returns full uri for source address
• added 7Bit encoding/decoding transformations

• add optional check for local path during lookup()
  • when performing a lookup the Path (if present) is evaluated and if the first hop is local we skip it to avoid looping

• new variable class $rdir(key)
  • return the direction of the request within dialog
  • $rdir(id) - returns integer 1 for downstream and 2 for upstream
  • $rdir(name) - returns the strings 'downstream' or 'upstream'
• new config variables $fti and $tti
  • $fti - from tag as in initial INVITE
  • $tti - to tag as in the response to the initial INVITE

• rtpengine_tout is now rtpengine_tout_ms
  • rtpengine tout param is now expressed in milliseconds and renamed
• new write_sdp_pv parameter, to return the new SDP in a $var() or $avp() instead of message body
• new modparam force_send_interface
• rtp_inst_pvar: pseudo variable to store the chosen RTP engine address

• new function sdp_with_active_media
  • return true of the SDP has 'media=type …' line and the media is active.
  • active media means the port is non-zero and the direction is not “inactive”

• new function is_tel_number(val)
  • returns true if the parameter is a telephone number (optional leading + followed by digits)
• new function is_numeric(val)

• options to set TLS versions lower limit
  • example: if method is set to TLSv1.1+, then the connection must be TLSv1.1 or newer

• new function t_is_retr_async_reply to check if a reply being processed is part of a transaction currently suspended
• handle r-uri alias parameter for local generated requests within a dialog
• default value for failure_reply_mode set to 3 - discard previous replies if a new serial forking step is done

• $T_branch(uri) - return uri of the branch when processing a reply in tm onreply_route

• new MI and RPC commands

• new parameter: close_expired_tcp. When set to 1, usrloc will close the corresponding TCP connection for expired entries.

• xlog: new log function xlogm(…) - logs with method filtering
  • same as xlog(level, message), fitering on methods
• new parameter methods_filter - a bitmask with internal sip method ids to be skipped from printing logs. Default -1 (skip all)
• parameter can be set at runtime via cfg reload framework kamcmd cfg.set_now_int xlog methods_filter 15

• execute onsend_route for replies before sending out
  • control execution of onsend_route block for replies via parameter onsend_route_reply
• default tcp read buffer size set to 16kB
• pv print default buffer size set to 8kB
• default size for shared memory is 64MB
• new parameter - max_branches
  • the maximum number of uac branches can be set via config
  • default value is 12 (old static value for MAX_BRNACHES)
  • the upper limit is 31, it has to be at least 1
• preprocessor subst rules are applied to pv names

• Two Level Segregated Fit memory allocator
  • http://tlsf.baisoku.org
• bounded-time performance memory manager
• malloc and free operations always done in O(1)
• build with MEMMNG=2 option to activate TLSF

• support of fnmatch operator for dialplan
  • do not reload rules in memory after each change in database to allow batch updates. Reload command has to be done explicitely
  • parameters of addrule after match expression are optional

Support reproducible builds adding compile options to skip compile date or set a particular value

• default is current behaviour, date and time included in version string
• compile with no date and time:

  make CC_EXTRA_OPTS="-DVERSION_NODATE"

• compile with a specific date and time:

  make CC_EXTRA_OPTS='"-DVERSION_DATE=\"19:30:40 Feb  8 2015\""'