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Cisco Bug: CSCuj36726 - T38 - Missing or corrupted lines in outgoing fax when fax page is long

Last Modified

Mar 09, 2018

Products (1)

  • Cisco 2900 Series Integrated Services Routers

Known Affected Releases


Description (partial)

Outgoing fax from Cisco voice gateway (IP to TDM) might have missing or corrupted lines when the fax page is long. Longer fax pages cause DSP buffer overflows and packet loss resulting in missing or corrupted lines.

Snippet of "show voice call x/y/z:p.c" output indicating buffer overflows, packet drops and packet loss. 

Max Jit Depth: 600, Max Nwk RxQ Depth 30, Jitter Overflow Pkt Drops: 5
Nwk RxQ Overflow: 27, Tx Pkts: 97, Tx Pkts Drops(Nwk Busy): 0
Rx Pkts: 9603, Rx Pkts Loss: 103, Rx Invalid Pkts: 0, Rx Pkts Out Of Seq: 0
Recent Hi-Speed Modulation: V.17/short/12000TX Pages: 4
Initial Hi-Speed Modulation: V.17/short/12000
Max SendInQ Depth 0, Max RecvOutQ Depth 0
Max Hi-Speed Buf Usage 0, SendInQ Overflow 0, RecvOutQ Overflow 0
Fax Direction is Receive
ECM is Enabled and NotInUse
Encapsulation Protocol is T.38 (UDPTL)
Country is Germany (Federal Republic of)
Packet loss conceal is 61
Manufacturer code is0404

T38 version 0
IOS version ? 15.2(3)T3
DSPware version ? 31.1.3
Issue is observed only with PVDM-3
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