== This TODO list is in order of importance (what I think is more important for users to have) ==

- Send logs to syslog

- DTMF/R2

- Add support for use 1 variant for outgoing calls and one for incoming calls

- Port to Windows

- Add metering pulse on demand after answering
An openr2 user in Thailand said:
The Answer has Forward "0 0" and backward "0 1"
Metering will change from  "|0 0|0 1|" and  to "|0 0|1 1|" for 150ms
before changing back to "|0 0| 0 1|"
it's like when a caller calls in we answer the call then play voice prompt asking
if the caller wants to use the service by pressing DTMF if not, hang them up
once the caller press whatever digit, we then send metering pulse to tell telco we
want to start charging so, it will be sent only once but if we want to change the tariff
during the call we send again I think. In my services I only send once

- block calls per specific category
mfcr2_category_block=1,5,7 (that should block categories 1 5 and 7 whatever they are)

- Imrpove CAS debugging to just show AB bits (probably even a special CAS file)