We have ISDN PRI link with direct phone numbers, one of this numbers we use as FAX. But when someone trying to send us the FAX message, we receive just some part of the document.
debug isdn q931 shows the following error
**ERROR**: call_progress: DEV_CONNECTED VOICE ERROR: Bearer capability not available(0x3A): b channel 3 call id 0x1AA2
thanks in advance.