DAHDI Analog Incoming Caller ID - module wctdm

Hi,
I have troubles receiving the caller id from my provider.
I have a Zyxel VMG8823-B50B provided by my provider with a VOIP to analog port.
The Zyxel is locked and I can’t access admin settings.

I have a wctdm DAHDI module and the caller id does not work with inbound calls.

This is my chan_dahdi.conf

;--------------------------------------------------------------------------------;
;          Do NOT edit this file as it is auto-generated by FreePBX.             ;
;--------------------------------------------------------------------------------;
; For information on adding additional paramaters to this file, please visit the ;
; FreePBX.org wiki page, or ask on IRC. This file was created by the new FreePBX ;
; BMO - Big Module Object. Any similarity in naming with BMO from Adventure Time ;
; is totally deliberate.                                                         ;
;--------------------------------------------------------------------------------;
[general]

; generated by module
#include chan_dahdi_general.conf

; for user additions not provided by module
#include chan_dahdi_general_custom.conf

[channels]
language=it
busydetect=yes
busycount=3
usecallerid=yes
callwaiting=yes
usecallingpres=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=no
echotraining=no
immediate=no
faxdetect=incoming
rxgain=0.0
txgain=0.0
callerid=asreceived
callwaitingcallerid=yes
hidecallerid=no
trustrpid=yes

; for user additions not provided by module
#include chan_dahdi_channels_custom.conf

; include dahdi groups defined by DAHDI module of FreePBX
#include chan_dahdi_groups.conf

; include dahdi extensions defined in FreePBX
#include chan_dahdi_additional.conf

PBX Firmware: 12.7.6-1904-1.sng7
PBX Service Pack: 1.0.0.0

What are the contents of the files referenced by #include?

If not present in any of them, try adding to chan_dahdi_channels_custom.conf:
cidsignalling=v23
and if no luck, also try adding:
cidstart=polarity
and/or
cid_rxgain=5.0

If still no luck, can you capture audio from the Zyxel so we can see the CID format, timing and level?

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