i’ve followed the Quectel_EC2x_EG9x_Voice_Over_USB_and_UAC_Application_Not_V1.0.pdf to enable UAC on my RM502Q-GL (fw version: RM502QGLAAR11A02M4G).
Using AirScreen tool, on the DIAG port I can see that VoLTE is successfully registered, but if i’m trying an inbound call I got:
- SIP Invite
- SIP 100 - Trying
- SIP 486 - Busy Here
So looks like that the module itself doens’t permit to answer the call. I’ve also tried to put it in WCDMA mode, and still no way to get a call. Trying an outgoing call with ATD command give me “NO CARRIER” error (both LTE/CS mode).
Interesting part is that and incoming call (both LTE/CS mode) doesn’t generate “RING” urc on AT port.
May i’m missing something special, or is a problem of the firmware that i’m running?
Thanks in advance