As I understand, if the caller does not support early media, the early media is discarded and execution of the dialplan proceeds further. Can I somehow check, that early media is rejected, and substitute it for ringing, for example?
Because ISDN is involved at some point, and most SIP uses early offer SDP, there is no way of detecting whether the upstream will discard early media. For ISDN, analogue, SIP early offer, at least, Asterisk knows where to send the media from the beginning of the call and will send the early media.
For further research, how does the non-user of the Progreass() application interact with this.
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