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Visual Voicemail Daemon (vvmd)
****************************
Copyright (C) 2021, Chris Talbot <chris@talbothome.com>
About
===========================
vvmd is a lower level daemon that retrieves Visual Voicemail
Notes
===========================
The protocols "cvvm", "vvm3", "ios", and AT&T USA (a proprietary protocol) configuration works.
References:
Andoird Notes on Visual Voicemail:
https://source.android.com/devices/tech/config/voicemail
Misc Notes on Voicemail:
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/253
Visual Voicemail OTMP Specification:
https://www.gsma.com/newsroom/wp-content/uploads/2012/07/OMTP_VVM_Specification_1_3.pdf
https://www.gsma.com/newsroom/wp-content/uploads/TS.46-v2.0.pdf
Carrier Configuration settings:
https://cs.android.com/android/platform/superproject/+/master:packages/apps/CarrierConfig/assets/
Android Dialer Voicemail Source code:
https://cs.android.com/android/platform/superproject/+/master:packages/apps/Dialer/java/com/android/voicemail/
Modem Manager Settings Notes
===========================
The Modem Manager settings file is in "$HOME/.vvm/$PLUGIN/vvm"
There are several settings in there that are managed by vvmd. Do not attempt to
change them! I am listing below the settings you can change:
It will then attempt to look up your carrier settings from:
https://gitlab.gnome.org/GNOME/mobile-broadband-provider-info
If it cannot find it, I highly suggest for you to add your carrrier settings here.
IMPORTANT NOTE: If you change settings in this file, vvmd MUST NOT BE RUNNING
in order for your settings to take effect! This is because vvmd
will overwrite the file when it exits, destroying your changes.
VVMEnabled
Whether you want to enable Visual Voicemail. Set to "true" or "false"
Changing this setting via dbus will automatically subscribe/unsubscribe
vvmd to/from the carrier's visual voicemail.
VVMType
What type of Visual Voicemail this is. In CarrierConfig, this is
found under "vvm_type_string".
AT&T USA is "AT&TUSAProprietary".
If "vvm_type_string" is not present, use "otmp".
VVMDestinationNumber
The destination number to send control SMS messages. In CarrierConfig,
this is found under "vvm_destination_number_string"
I am unsure of how to get the destination number if
"vvm_destination_number_string" is not present.
CarrierPrefix
The string prefix attached to SMS control messages. I believe Verizon
Wireless USA changes this to "//VZWVVM", but I have not tested this (nor
do I remember where I saw this).
If you use AT&T USA, put your phonenumber without space here (e.g. if
your phone number is "(432)555-0110", use "4325550110" (without quotes).
If unsure, leave this to the default "//VVM".
DefaultModemNumber
If you have multiple modems, this will allow you to only choose which
modem to connect to by reading its number. The number MUST be set to
E.164 Setting this to NULL means vvmd will connect to the first modem
it finds.
Unless you have multiple modems (not common), you can leave this set to
"NULL"
Compiling vvmd
============================
In order to compile proxy daemon you need following software packages:
- GCC compiler
- D-Bus library
- GLib library
- Modem Manager Library
- Curl Library
Installing vvmd
============================
Build tools requirements
When building and testing directly from the repository it is important to
have at least meson version 0.56 or later installed. In addition, some
supported Meson backend is required (e.g. ninja).
To prepare/configure the project for compilation:
# meson _build
To build the project:
# meson compile -C _build
Run tests:
# meson test -C _build
Install:
# meson install -C _build
Running from within the source code repository
==============================================
Meson will build the binary in builddir (_build, using the examples above), and
can be invoked directly.
Run with debugging
# ./_build/vvmd -d
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