Debugging the Cisco ATA 186/188 Fax Services
Analyzing rtpcatch Output for Fax Sessions
The following examples show the proper fax events when gateways are configured to operate in the
following modes:
•
•
•
•
Example 7-1
---------- FAX Summary 1 ----------
[
[
Analysis
Both sides use G.711 for the entire fax session.
Example 7-2
---------- FAX Summary 1 ----------
[
[
[
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
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
7-16
–
beginning of new audio codec
silence packets
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lost packets
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erased packets (as in G.729)
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The NSE events reported by rtpcatch include:
event 32, Fax Mode, CED tone Detected (RFC2833)
–
event 34, Modem Mode, ANSam tone Detected (RFC2833)
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event 192, Up-Speed, CED tone Detected
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event 193, ECAN OFF, Phase Reversal Detected
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event 194, ECAN ON, Silence Detected
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event 200, T38 Fax Mode, V.21 Detected
–
–
event 201, T38 Fax Mode ACK
event 202, T38 Fax Mode NACK
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–
event 203, Modem Relay Mode, CM Tone Detected
event Cisco Fax Relay (with RTP payload type 96)
–
event Cisco Fax Relay ACK (with RTP payload type 97)
–
Cisco ATA fax mode
Cisco ATA fax pass-through mode
T.38 fax relay mode
Cisco fax relay mode
Fax Mode
25]<2.131=>3.200> Codec G711u
26]<3.200=>2.131> Codec G711u
Fax Pass-through Mode
25]<2.213=>2.116> Codec G723
26]<2.116=>2.213> Codec G723
Chapter 7
Configuring and Debugging Fax Services
OL-4804-01