Hi, I'm trying to send a fax from a Zap channel to another Zap channel and I can't - below the logs. How could I solve this? Thanks! In RECEIVER: -- Accepting call from '' to '1980' on channel 0/2, span 1 Urgent handler -- Executing Answer("Zap/2-1", "") in new stack Urgent handler Urgent handler -- Executing Goto("Zap/2-1", "receive-fax|fax|1") in new stack Urgent handler -- Goto (receive-fax,fax,1) Urgent handler -- Executing RxFAX("Zap/2-1", "/fax/rx.tif") in new stack Urgent handler DCS with final frame tag In state 9 Coarse carrier frequency 1699.90 (66) Training error 0.249420 Training succeeded (constellation mismatch 0.407855) In SENDER: -- Executing TxFAX("Zap/1-1", "/fax/testX.tif|caller|debug") in new stack Urgent handler Slow carrier up Slow carrier down Slow carrier up <<< DIS: 80 00 ce f4 80 80 81 80 80 80 18 DIS with final frame tag In state 10 DIS: Prefer 256 octet blocks Can receive fax Supported data signalling rates: V.27ter and V.29 R8x7.7lines/mm and/or 200x200pels/25.4mm 2D coding Scan line length: 215mm Recording length: Unlimited Receiver's minimum scan line time: 0ms at 3.85 l/mm: T7.7 = T3.85 R8x15.4lines/mm Minimum scan line time for higher resolutions: T15.4 = T7.7 North American Letter (215.9mm x 279.4mm) North American Legal (215.9mm x 355.6mm) DCS: Can receive fax Selected data signalling rate: V.29, 9600bps 2D coding Scan line length: 215mm Recording length: A4 (297mm) Minimum scan line time: 20ms Minimum scan line time for higher resolutions: T15.4 = T7.7 Start sending document Start tx document Changed from phase 2 to 4 >>> DCS: 83 00 c6 80 80 80 00 HDLC underflow in state 3 Changed from phase 4 to 6 Changed from phase 6 to 3 Slow carrier up Slow carrier down T4 timeout in state 4