[asterisk-r2] Rx CAS 0x08

[Vinicius Fontes]

Hello. I'm having an issue on multiple customers where sometimes most
channels have their Rx CAS set as 0x08. When it happens, I can't place
calls on those channels, and the following happens:

[Oct  8 10:45:54]     -- Executing [1 at teste:1] Dial("Console/dsp",
"DAHDI/62/*REDACTED*") in new stack
[Oct  8 10:45:54] WARNING[1328][C-00002b9d]: app_dial.c:2437
dial_exec_full: Unable to create channel of type 'DAHDI' (cause 17 - User
busy)
[Oct  8 10:45:54]   == Everyone is busy/congested at this time (1:1/0/0)
[Oct  8 10:45:54]     -- Auto fallthrough, channel 'Console/dsp' status is
'BUSY'

Here's the output of 'mfcr2 show channels' and 'mfcr2 show version' when it
happens:

Chan Variant Max ANI Max DNIS ANI First Immediate Accept Tx CAS   Rx CAS
  32 BR      20      4        No        No               IDLE     IDLE
  33 BR      20      4        No        No               SEIZE    ANSWER
  34 BR      20      4        No        No               SEIZE AC SEIZE
  35 BR      20      4        No        No               ANSWER   SEIZE
  36 BR      20      4        No        No               IDLE     IDLE
  37 BR      20      4        No        No               IDLE     IDLE
  38 BR      20      4        No        No               IDLE     0x08
  39 BR      20      4        No        No               IDLE     0x08
  40 BR      20      4        No        No               IDLE     0x08
  41 BR      20      4        No        No               IDLE     0x08
  42 BR      20      4        No        No               IDLE     0x08
  43 BR      20      4        No        No               IDLE     0x08
  44 BR      20      4        No        No               IDLE     0x08
  45 BR      20      4        No        No               IDLE     0x08
  46 BR      20      4        No        No               IDLE     0x08
  48 BR      20      4        No        No               IDLE     0x08
  49 BR      20      4        No        No               IDLE     0x08
  50 BR      20      4        No        No               IDLE     0x08
  51 BR      20      4        No        No               IDLE     0x08
  52 BR      20      4        No        No               IDLE     0x08
  53 BR      20      4        No        No               IDLE     0x08
  54 BR      20      4        No        No               IDLE     0x08
  55 BR      20      4        No        No               IDLE     0x08
  56 BR      20      4        No        No               IDLE     0x08
  57 BR      20      4        No        No               IDLE     0x08
  58 BR      20      4        No        No               IDLE     0x08
  59 BR      20      4        No        No               IDLE     0x08
  60 BR      20      4        No        No               IDLE     0x08
  61 BR      20      4        No        No               IDLE     0x08
  62 BR      20      4        No        No               IDLE     0x08

OpenR2 version: 1.3.3, revision: (release)

If I restart Asterisk, all channels go back to IDLE on both Tx and Rx and I
can place calls on them again.

It seems like a bug to me. What other information is needed to investigate
this?

Here's the relevant section of chan_dahdi.conf for those channels:

signalling=mfcr2
mfcr2_variant=br
mfcr2_get_ani_first=no
mfcr2_max_ani=20
mfcr2_max_dnis=4
mfcr2_category=national_subscriber
mfcr2_logdir=span1
mfcr2_call_files=yes
mfcr2_logging=all
mfcr2_mfback_timeout=-1
mfcr2_metering_pulse_timeout=-1
mfcr2_allow_collect_calls=yes
mfcr2_double_answer=no
mfcr2_immediate_accept=no
mfcr2_forced_release=no
mfcr2_charge_calls=yes
language=pt_BR
echocancel=yes
echocancelwhenbridged=no
context=_operadora
callgroup=0
pickupgroup=0
group=1
channel => 32-46,48-62
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