Hi Bret,

Just a heads up: it is customary to not top-post on open source mailing 
lists.  So please don't do that in the future ;)

On 08/08/2012 07:36 AM, Bret Hassler wrote:
> It's a Vtech DS6321-3.
> https://www.bluetooth.org/tpg/EPL_Detail.cfm?ProductID=13096
> It provides a Handsfree Gateway service. I was wondering if it doesn't send any callsetup indicators because it is not cellular. Otherwise, you're probably correct that it's not a proper device.
>

HFP 1.6 does explicitly state that callsetup is required in the case of 
an outgoing call being dialed from the HF.  There is no equivalent 
sequence diagram for the call being dialed from the AG, however this is 
mandated by TR002.  So from that standpoint you're a little bit unlucky 
in that your device is not really compliant.

Just quickly glancing at the product page, it does indicate mobile phone 
compatibility.  Maybe the HFP part is only meant when you're using it 
with a mobile network.

That said, you can try to hack around this a bit by detecting the call=0 
-> call=1 transition regardless of callsetup, but you'd still be missing 
any sort of dialed number information, etc.  Not sure how really useful 
oFono would be for this usecase.

Regards,
-Denis