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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)
OL-4803-01
Chapter 6 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
This indicates that rtpcatch detected two lost RTP packets in the audio path <02>. The missing
packets began with sequence number 39. This occurred at packet number 106.
• ------------ Summary --------------
Input file: faxpassthru.cap
<00.723>: (G723) 2.213:10000 => 2.116:10002
total 38 pkts(70 frames), lost 0 pkts, fill 7 silence pkts
This indicates that the input filename is faxpassthru.cap. The output file 00.723 contains the
G.723-compressed stream from <2.123:10000> to <2.116:10002>; 38 packets (70 frames) were
processed by rtpcatch. No lost packets were detected and seven silence packets were found.
• ---------- FAX Summary 1 ----------
[ 25]<2.213=>2.116> Codec G723
[ 26]<2.116=>2.213> Codec G723
[ 101]<2.116=>2.213> Codec G711u/D
[ 102]<2.116=>2.213> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 103]<2.116=>2.213> NSE PT 100, EVT 193: ECAN OFF, Phase Reversal Detected
[ 105]<2.213=>2.116> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 107]<2.213=>2.116> Codec G711u/D
This indicates that the audio streams originating at <2.213> and <2.216> are G.723-compressed.
The audio stream from <2.116> was then up-sped to G.711µ-law at packet number 101. The NSE
signaling packets were sent at packet number 102, 103 and 105. Finally, the audio stream from
<2.113> was up-sped to G.711µ-law.
• ---------- FAX Summary 2 ----------
PATH: 2.213:10000 => 2.116:10002
[ 25]Codec G723
[ 105]NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 107]Codec G711u/D
PATH: 2.116:10002 => 2.213:10000
[ 26]Codec G723
[ 101]Codec G711u/D
[ 102]NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 103]NSE PT 100, EVT 193: ECAN OFF, Phase Reversal Detected
This summarizes the fax events for each path.
The audio stream events reported by rtpcatch include:
–
beginning of new audio codec
–
silence packets
–
lost packets
–
erased packets (as in G.729)
The NSE events reported by rtpcatch include:
–
event 32, Fax Mode, CED tone Detected (RFC2833)
–
event 34, Modem Mode, ANSam tone Detected (RFC2833)
–
event 192, Up-Speed, CED tone Detected
–
event 193, ECAN OFF, Phase Reversal Detected
–
event 194, ECAN ON, Silence Detected
–
event 200, T38 Fax Mode, V.21 Detected