we've 3pcs SPA112 in a customer project all updated to the latest firmware and all working well, meaning sending and receiving of faxes is working.
Fax transmit to two special fax recipients isn't working. It seems that the recipient has a automated fax server system and the connection is established immediately. Meaning that between a 180 Ringing and a 200 OK message is no time in that the SPA112 could generate a ringtone. Without the ringtone the fax machines doesn't detect a established connection and no fax transmit will happen.
Is there any chance to force the generation of at least one ring tone?
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