Re: [RFCv3] doc: Proposal for LTE/IMS API

[Arun Ravindran <ext-arun.1.ravindran@nokia.com>]

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Hi Sjur,

I have a doubt on this interface
> +		void Register(array{string} types)
> +
> +			Registers an IMS Application. It must register
> +			with at least one of the types: "voice" or "messaging".
> +			In future "video" (Conversational Video, Live
> +			Streaming) should be added. This registration will
> +			inform the modem's radio stack that the IMS application
> +			has registered for Voice and/or Messaging over IMS.
> +			This registration may impact "UE Mode of operation"
> +			and the ISR feature in the radio stack.
> +
> +			The registered application is tracked, if the
> +			application exits the registration will be
> +			automatically released.
> +
> +			Possible Errors: [service].Error.InvalidArguments
27.007 describes +CEMODE which sets the UE mode of operation and is 
referring to 24.301.

There are only 4 modes PS Mode 1, PS Mode 2, PS/CS Mode 1, PS/CS Mode 
2.  These modes only specify, what type of attach is required (a IMSI, 
EPS or a combined). Also if UE supports CSFB, it should be in CS/PS 
modes . There is also +VCMOD which can be used to decide whether to use 
CS or PS for voice calls.

What does the Register interface do w.r.t ofono? What AT commands could 
be used here to signal the UE mode of operation to modem?

How does "voice" or "messaging" relate to the 4 modes specified in 
27.007 and 24.301?

Regards
Arun