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Over the past couple of months, a number of issues with Asterisk negotiating (and successfully completing) T.38 sessions with various endpoints have been found. This patch attempts to address many of them, primarily focused around ensuring that the endpoints' MaxDatagram size is honored, and in addition by ensuring that T.38 session parameter negotiation is performed correctly according to the ITU T.38 Recommendation. The major changes here are: 1) T.38 applications in Asterisk (app_fax) only generate/receive IFP packets, they do not ever work with UDPTL packets. As a result of this, they cannot be allowed to generate packets that would overflow the other endpoints' MaxDatagram size after the UDPTL stack adds any error correction information. With this patch, the application is told the maximum *IFP* size it can generate, based on a calculation using the far end MaxDatagram size and the active error correction mode on the T.38 session. The same is true for sending *our* MaxDatagram size to the remote endpoint; it is computed from the value that the application says it can accept (for a single IFP packet) combined with the active error correction mode. 2) All treatment of T.38 session parameters as 'capabilities' in chan_sip has been removed; these parameters are not at all like audio/video stream capabilities. There are strict rules to follow for computing an answer to a T.38 offer, and chan_sip now follows those rules, using the desired parameters from the application (or channel) that wants to accept the T.38 negotiation. 3) chan_sip now stores and forwards ast_control_t38_parameters structures for tracking 'our' and 'their' T.38 session parameters; this greatly simplifies negotiation, especially for pass-through calls. 4) Since T.38 negotiation without specifying parameters or receiving the final negotiated parameters is not very worthwhile, the AST_CONTROL_T38 control frame has been removed. A note has been added to UPGRADE.txt about this removal, since any out-of-tree applications that use it will no longer function properly until they are upgraded to use AST_CONTROL_T38_PARAMETERS. Review: https://reviewboard.asterisk.org/r/310/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@208464 65c4cc65-6c06-0410-ace0-fbb531ad65f3
160 lines
8.1 KiB
Plaintext
160 lines
8.1 KiB
Plaintext
===========================================================
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===
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=== Information for upgrading between Asterisk 1.6 versions
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===
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=== These files document all the changes that MUST be taken
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=== into account when upgrading between the Asterisk
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=== versions listed below. These changes may require that
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=== you modify your configuration files, dialplan or (in
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=== some cases) source code if you have your own Asterisk
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=== modules or patches. These files also includes advance
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=== notice of any functionality that has been marked as
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=== 'deprecated' and may be removed in a future release,
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=== along with the suggested replacement functionality.
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===
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=== UPGRADE-1.2.txt -- Upgrade info for 1.0 to 1.2
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=== UPGRADE-1.4.txt -- Upgrade info for 1.2 to 1.4
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=== UPGRADE-1.6.txt -- Upgrade info for 1.4 to 1.6
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===
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===========================================================
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T.38 changes in 1.6.0.11, 1.6.1.2, 1.6.2.0:
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Beginning with each of these releases in their respective branches,
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Asterisk's internal methods of negotiating T.38 (FAX over IP) sessions
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changed in non-backwards-compatible ways. Any applications that previously
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used AST_CONTROL_T38 control frames will have to be upgraded to use
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AST_CONTROL_T38_PARAMETERS control frames instead; app_fax.c is a good
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example of how to generate and respond to these frames. These changes were
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made to solve significant T.38 interoperability problems between Asterisk
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and various SIP/T.38 endpoints identified by many users of Asterisk.
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From 1.6.2 to 1.6.3:
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* Asterisk-addons no longer exists as an independent package. Those modules
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now live in the addons directory of the main Asterisk source tree. They
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are not enabled by default. For more information about why modules live in
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addons, see README-addons.txt.
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* The rarely used 'event_log' and LOG_EVENT channel have been removed; the few
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users of this channel in the tree have been converted to LOG_NOTICE or removed
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(in cases where the same message was already generated to another channel).
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* The usage of RTP inside of Asterisk has now become modularized. This means
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the Asterisk RTP stack now exists as a loadable module, res_rtp_asterisk.
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If you are not using autoload=yes in modules.conf you will need to ensure
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it is set to load. If not, then any module which uses RTP (such as chan_sip)
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will not be able to send or receive calls.
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* The app_dahdiscan.c file has been removed, but the dialplan app DAHDIScan still
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remains. It now exists within app_chanspy.c and retains the exact same
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functionality as before.
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From 1.6.1 to 1.6.2:
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* The default console now will use colors according to the default background
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color, instead of forcing the background color to black. If you are using a
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light colored background for your console, you may wish to use the option
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flag '-W' to present better color choices for the various messages. However,
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if you'd prefer the old method of forcing colors to white text on a black
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background, the compatibility option -B is provided for this purpose.
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* SendImage() no longer hangs up the channel on transmission error or on
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any other error; in those cases, a FAILURE status is stored in
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SENDIMAGESTATUS and dialplan execution continues. The possible
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return values stored in SENDIMAGESTATUS are: SUCCESS, FAILURE, and
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UNSUPPORTED. ('OK' has been replaced with 'SUCCESS', and 'NOSUPPORT'
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has been replaced with 'UNSUPPORTED'). This change makes the
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SendImage application more consistent with other applications.
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* skinny.conf now has separate sections for lines and devices.
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Please have a look at configs/skinny.conf.sample and update
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your skinny.conf.
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* Queue names previously were treated in a case-sensitive manner,
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meaning that queues with names like "sales" and "sALeS" would be
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seen as unique queues. The parsing logic has changed to use
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case-insensitive comparisons now when originally hashing based on
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queue names, meaning that now the two queues mentioned as examples
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earlier will be seen as having the same name.
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* The SPRINTF() dialplan function has been moved into its own module,
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func_sprintf, and is no longer included in func_strings. If you use this
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function and do not use 'autoload=yes' in modules.conf, you will need
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to explicitly load func_sprintf for it to be available.
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* The res_indications module has been removed. Its functionality was important
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enough that most of it has been moved into the Asterisk core.
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Two applications previously provided by res_indications, PlayTones and
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StopPlayTones, have been moved into a new module, app_playtones.
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* Support for Taiwanese was incorrectly supported with the "tw" language code.
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In reality, the "tw" language code is reserved for the Twi language, native
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to Ghana. If you were previously using the "tw" language code, you should
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switch to using either "zh" (for Mandarin Chinese) or "zh_TW" for Taiwan
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specific localizations. Additionally, "mx" should be changed to "es_MX",
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Georgian was incorrectly specified as "ge" but should be "ka", and Czech is
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"cs", not "cz".
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From 1.6.0.1 to 1.6.1:
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* The ast_agi_register_multiple() and ast_agi_unregister_multiple()
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API calls were added in 1.6.0, so that modules that provide multiple
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AGI commands could register/unregister them all with a single
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step. However, these API calls were not implemented properly, and did
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not allow the caller to know whether registration or unregistration
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succeeded or failed. They have been redefined to now return success
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or failure, but this means any code using these functions will need
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be recompiled after upgrading to a version of Asterisk containing
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these changes. In addition, the source code using these functions
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should be reviewed to ensure it can properly react to failure
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of registration or unregistration of its API commands.
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* The ast_agi_fdprintf() API call has been renamed to ast_agi_send()
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to better match what it really does, and the argument order has been
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changed to be consistent with other API calls that perform similar
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operations.
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From 1.6.0.x to 1.6.1:
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* In previous versions of Asterisk, due to the way objects were arranged in
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memory by chan_sip, the order of entries in sip.conf could be adjusted to
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control the behavior of matching against peers and users. The way objects
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are managed has been significantly changed for reasons involving performance
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and stability. A side effect of these changes is that the order of entries
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in sip.conf can no longer be relied upon to control behavior.
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* The following core commands dealing with dialplan have been deprecated: 'core
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show globals', 'core set global' and 'core set chanvar'. Use the equivalent
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'dialplan show globals', 'dialplan set global' and 'dialplan set chanvar'
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instead.
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* In the dialplan expression parser, the logical value of spaces
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immediately preceding a standalone 0 previously evaluated to
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true. It now evaluates to false. This has confused a good many
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people in the past (typically because they failed to realize the
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space had any significance). Since this violates the Principle of
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Least Surprise, it has been changed.
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* While app_directory has always relied on having a voicemail.conf or users.conf file
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correctly set up, it now is dependent on app_voicemail being compiled as well.
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* SIP: All of the functionality in SIPCHANINFO() has been implemented in CHANNEL(),
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and you should start using that function instead for retrieving information about
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the channel in a technology-agnostic way.
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* If you have any third party modules which use a config file variable whose
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name ends in a '+', please note that the append capability added to this
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version may now conflict with that variable naming scheme. An easy
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workaround is to ensure that a space occurs between the '+' and the '=',
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to differentiate your variable from the append operator. This potential
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conflict is unlikely, but is documented here to be thorough.
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* The "Join" event from app_queue now uses the CallerIDNum header instead of
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the CallerID header to indicate the CallerID number.
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* If you use ODBC storage for voicemail, there is a new field called "flag"
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which should be a char(8) or larger. This field specifies whether or not a
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message has been designated to be "Urgent", "PRIORITY", or not.
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