Hi Jan,

>> oFono is the one establishing the GPRS context. Some other daemon
>> makes the control decisions on what context should be established and
>> when. e.g. connman makes this decision in the case of Type=internet
>> contexts and something like mmsd makes this decision for Type=mms
>> contexts.
>
> I will check mmsd thank you for the info. Do you know if it is a mature
> project? I mean if it can be used for basic mms sending?
>

It should be complete enough to allow basic mms send and receive, yes. 
However, the project is not (yet) up to the same level of maturity / 
quality / stability as oFono.

>>> task for another daemon like connman or something similar? If yes how
>>> these daemons communicate with ofono when they are grabbing the
>>> interface for making ppp conection?
>>>
>>
>> I'm not quite sure I understand the question? The context
>> establishment is achieved using org.ofono.ConnectionContext interface,
>> e.g. by setting the 'Active' property. The PPP connection is done by
>> oFono itself.
>
> I'd like to use ofono to be able to do voice calls and sms messaging.
> Without ofono, I'm able to connect to internet over PPP using pppd
> daemon with proper script using one of the modem interfaces
> (ttyUSBx/ttyACMx). Such connection can be done directly using ofono
> (without pppd)?

oFono has its own internal ppp stack, no pppd is required.  If your 
modem supports a high-speed interface, then that should be used instead.

And yes, you can do voice calls, sms and internet at the same time with 
oFono.  Assuming of course you have at least two ttys available or your 
modem supports multiplexing.

Regards,
-Denis