Comment 2 for bug 1418040

I guess the problem here is that telephony-service is not involved in the process of placing the call: that's all done at the ofono level.
When telepathy-ofono (and thus telephony-service) get notified about the call, it is already placed in the wrong modem.

I don't know how this is handle inside ofono, but maybe there is a way for us to set a property saying which of the modems should be used when placing calls via HFP?