Gary,
For the record on the forum the ringing status depends on the layer 3 signalling sent to the UE when making the call. Ringing is provided in band on the audio channel by the network so unless the network also sends the ‘alerting’ message on layer 3 messaging the unit has no way of knowing that the call is actually ringing as it is just audio data. You can actually see this on your handset as it doe not change any on screen status until the call is actually connected and charging is started as the connected is a mandatory message.
On the HL7692 and HL85xx for real time information you should use really use at+xcallstat which provides unsolicited responses as to the progress of the call.
Regards
Matt