The PCM audio does not work in FW. Therefore no voice calls over VoLTE. Does anyone at Sierrawireless have any update on when this Release 7 FW will arrive? See end of this thread.
This feature is in development. Maybe, they will be released soon in next FW released.
You can follow the page https://source.sierrawireless.com/resources/airprime/software/rc76xx/rc76xx-firmware-release-6,-d-,2/#sthash.Jai5kAjc.KflaN6fP.dpbs, new releases will be updated here.
So generically speaking voice does work, be it VoLTE or voice over CS and the only interface is PCM which again works. Its not terribly configurable at the moment which R8 is going to fix (we are skipping R7) which is due in the next few weeks.
R9 is the big update though which is specifically aimed at RC7611 with operator approval updates (which R8 won’t have), this is due in July with the approvals completing as and when we manage to get through the testing.
That is great news about the updates. Presently I configure the PCM audio interface with !AVCFG set to PCM and also tried I2S mode. I configure for audio master mode, interface 0. I have set !AVSETPROFILE to interface 0. I do not know any other command that would enable the audio. I can call a number and the response is “CONNECT.” At that point I assume the audio interface should be active. But all digital audio out lines PCM_OUT, PCM_SYNC, PCM_CLK remain high impedance. I can use a 10k resistor to change the state of the pins which would not happen if they were outputs. The RC7611 has does not have CS capability. The !GSTATUS command says I have full VOLTE operation and that is what I want to use. What else do I need to do to get audio?
So I did the below test and the call went straight through, I have not done it with the R6.2 (00.03.03) firmware but would expect it to be the same. I used a mangOH red and the audio came through the jack no problems it was a little loud so needed tweaking).
RC76 VoLTE call EE - R8 firmware.txt (1.7 KB)
Your AT text commands are what I have been using. I attached my file.
RC76 VoLTE call fail.txt (1.9 KB)
I still do not get any audio PCM signals with this version 6.2, Generic type. BTW I have an HL7648 and the audio works great with the expected PCM signals from that module using the same hardware setup I am using for the RC7611. I have changed to the RC7611 because it seems the HL7648 is obsolete or becoming so. I will wait for the firmware update. Your testing verified that I will get this module working. Thanks.