[ASTERISK-112] chan_dahdi: Raw power ring audible on recall ring from IAX2 to DAHDI

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Compilation warnings on 32-bit (i686)
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server_setup.sh: Autocreate all default directories
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net_imap: IMAP client frequently fails for Microsoft accounts
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format_mp3 prereqs not always available
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slack-client: Deadlock when relaying messages
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Failed to receive reply... when message sent
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ASTERISK-15
chan_dahdi: Allow sending SDMF Caller ID
ASTERISK-104
Improve dahdi show channels output
ASTERISK-112
chan_dahdi: Raw power ring audible on recall ring from IAX2 to DAHDI
ASTERISK-22
general: Fix various typos
ASTERISK-111
chan_dahdi: MWI while off-hook when hung up on after recall ring
ASTERISK-64
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ASTERISK-108
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Checkbox range selection doesn't always work reliably
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verify.conf: Flag invalid NXXs as illegitimate for NANPA calls
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mod_operator: Crash with more than 64 options?
ASTERISK-19
chan_dahdi: Remove sig_analog paths
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net_imap: Soft assertion in parse_flags_string
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net_imap, io_compress: Spurious warnings if quota exceeded
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Operator system PSPs are outdated
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Email enhancements
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Add menu system scripting engine
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net_irc: Make ping interval adjustable
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GitHub Issue 661 was not autoclosed by PR
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app_predial: Failure to retrieve user agent property
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Show only sum of message units used per month on bills
ASTERISK-96
asterisk.adsi: Add Call Waiting Deluxe integration to resident script
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ASTERISK-102
app_voicemail: Play RDNIS if present when listening to envelope
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dsp.c: Remove ast_ prefixes for static functions
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dsp.c: coin DSP patch breaks faxing
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Can scroll down past bottom of page on larger screens
WSSMAIL-9
Sent email uploads can fail due to relative host difference
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examples: Add example program to log everything to a CSV
LBBS-52
net_smtp: Add limited support for VRFY and EXPN
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Provisioning fails for lines with certain features
ASTERISK-100
chan_dahdi: PRI lock held at module unload
LBBS-51
General TDD improvements
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Splice Fred Covington prompts for speaking clock
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Add functionality expected of a traditional BBS package
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Add NNTP support and IRC integration
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Add better test coverage for 32-bit systems
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ASTERISK-91
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ASTERISK-90
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ASTERISK-89
app_stack: Print proper exit location for PBXless channels
ASTERISK-87
asterisk.c: Prevent creation of duplicate Asterisk processes
ASTERISK-86
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ASTERISK-85
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ASTERISK-81
format_lame: MP3 read and write with LAME library
ASTERISK-80
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ASTERISK-79
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ASTERISK-78
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ASTERISK-77
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LBBS-35
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LBBS-34
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LBBS-33
net_imap: Add/standardize commands to modify or purge keywords
ASTERISK-76
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ASTERISK-75
chan_dahdi: Add Call Hold feature
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ASTERISK-73
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app_if: ElseIf executed even if If is true
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dahdi_cfg: Compiler warnings
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build: Compiler warnings
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app_dialtone: t option should exclude matches that include #
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Temporary files not always cleaned up
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pty.c: Attempt to lock previously destroyed mutex
ASTERISK-67
voicemail.conf.sample: maxsilence/minsecs trigger warning
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app_sf: ReceiveSF not detecting incoming SF
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ASTERISK-65
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Add PHPMailer support for format=flowed
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LBBS-10
mod_sysop: Allow modifying user info from console
LBBS-9
mod_webmail: Improve MIME parsing to extract HTML/PT components
LBBS-8
net_imap: Accounts occasionally fail to load or are reordered
LBBS-7
Fix backspace detection/handling
LBBS-5
tests: Add TLS tests
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module.c: Module ref tracking is flaky
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module.c: Improve module loading process
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ASTERISK-62
app_followme: use enum for tmpuser->state
ASTERISK-61
func_groupcount: Add see-also for GROUP functions
ASTERISK-60
users.conf: Remove deprecated config file
ASTERISK-59
chan_dahdi: Remove stripmsd
ASTERISK-58
xml: Add config documentation
ASTERISK-57
bridging: Make DAHDI, always softmix bridging modules
ASTERISK-56
res_musiconhold: Add recursive files support
ASTERISK-55
chan_dahdi: add NUM_ANALOG_SUBS
ASTERISK-54
loader: Fix reloading using config name
ASTERISK-53
formats: add ulaw/alaw WAV support
ASTERISK-51
app_originate: Allow spooling future calls
PHREAKSCRIPT-14
app_selective: Allow wildcard * patterns
ASTERISK-50
app_dial: Fix or document r tonezone option
ASTERISK-49
Remove all deprecated stuff
ASTERISK-48
func_devstate: Delete empty from AstDB
ASTERISK-47
res_pjsip_session: Warn if no shared codecs
ASTERISK-45
app_voicemail: Option 4 at main menu
ASTERISK-44
format_pcm: Fix seek past end
DAHTOOL-1
system.conf: Fix typos
DAHLIN-2
Fix typos and dead links
ASTERISK-43
pbx_builtins: allow Answer to specify the channel
ASTERISK-42
sig_pri: Add CLI description
ASTERISK-41
app_confbridge: Document binaural_active
ASTERISK-40
pjsip: document MessageSend AOR limitation
ASTERISK-39
app_dial: ANSWEREDTIME documentation
ASTERISK-38
config: Fix missing config log consistency
ASTERISK-37
chan_pjsip: CALLERID(ani2) not working
ASTERISK-36
res_pjsip_logger: Add filtering by username
ASTERISK-35
sig_analog: Fix buffer overflow
ASTERISK-34
app_queue: Allow setting context at runtime

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Details


Steps to reproduce:

  1. Make a call from A (which could be anything), over an IAX2 to trunk to a DAHDI phone, B (in my testing, A and B are on different Asterisk systems). threewaycalling must be enabled (at least for B).
  2. Answer B, then flash to put A on hold.
  3. OBSERVATION #1: If Set(CHANNEL(musicclass) is used to set MOH for the call, a DAHDI to DAHDI call but not an IAX2 to DAHDI call (such as this one) will hear MOH. The IAX2 call will just be silent, for some reason.
  4. Hang up B, which will trigger a recall ring for the call on hold.
  5. BUG #1: A will hear "power ring" (the actual audio as if you were listening to dahdi_monitor) for the recall ring to B, until B answers. This is actually really cool, but this should NOT be happening. For one, this is "information leakage" which is not allowed from a security perspective. A should never know if B is simply off hook or has hung up and receiving a recall ring. This exposes this information since when B hangs up, the call goes from silence to hearing power ring until the call is answered again.

Note that this power ring will sound different on each system. On one system with a 24-port analog card, it sounds really cool, almost like a city ringback tone, and on another system with a 4-port analog card, you don't really hear much "power ring at all", it's almost silent. Makes sense and adds to the uniqueness of this functionality!

This all happens even without the hearpulsing setting enabled (though the patches are present) in 21.3.1.

ACTION ITEM: Fix BUG #1 so it doesn't happen. The obvious first step is compare a DAHDI to DAHDI call and IAX2 to DAHDI and see what's different (control frame differences?) Part of the fix may entail in chan_dahdi dropping audio towards the caller (e.g. dahdi_read) if a recall ring is ongoing.

It would be very nice to be able to hear power ring as the regular ring, in general - so not in this scenario, since that isn't allowed (A should hear MOH or just silence the whole time), but in general when A calls B, instead of precise ringback, we have the option to provide the actual power ringing audio. This can actually be accomplished by enabling "hearpulsing=yes". It does exactly what we would want and expect here. As such, this provides a clue towards resolution, effectively "hearpulsing" is active on recall ring in the IAX2 to DAHDI scenario, even though it shouldn't be. So, really, there are 2 things to do here:

  1. Fix chan_dahdi so that this audio is dropped (no hearpulsing) during recall rings.
  2. Investigate why chan_iax2 differs from a DAHDI to DAHDI call in this case.

Fixes should be done at the same time (but only one at a time and then reverted) so both can be verified: i.e. if 2 is fixed first, it will be difficult to verify if 1 is resolved, and if 1 is resolved, it will be difficult to (audibly) investigate 2.

As far as #1 goes, this seems like a possible solution:


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