Re: Terminating emergency calls

[Denis Kenzior <denkenz@gmail.com>]

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Hi Sjur,

On 08/12/2010 12:39 PM, Sjur Brændeland wrote:
> Hi Denis.
> 
> I thought of one more issue with voice calls.
> I don't think it is safe to to terminate emergency calls using
> release_specific, AT+CHLD=1X.
> At least this don't work for STE modems.
> 
> I suggest calls in state active should be terminated using hangup_all
> or hangup_active.
> What do you think?

So in the case of a single call, the emergency call will be terminated
using hangup_all / hangup_active anyway.  I have relaxed the single call
restriction for active calls when hangup_active is provided by the
driver.  Refer to c7b13ec2fe664b122216a312f2442c9ca26f5f43

For mpty calls this gets tricky.  I'd like some answers to these questions:

- Can Emergency calls participate in mpty?
- Can Emergency calls be HELD?
- How do we recognize Emergency calls?  Is simple string matching of
numbers in EmergencyNumbers of VoiceCallManager enough?

Regards,
-Denis