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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SCCP)
Ol-3141-01
Chapter 6 Configuring and Debugging Fax Services
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:
• Cisco ATA fax mode
• Cisco ATA fax pass-through mode
• T.38 fax relay mode
• Cisco fax relay mode
Example 6-1 Fax Mode
---------- FAX Summary 1 ----------
[ 25]<2.131=>3.200> Codec G711u
[ 26]<3.200=>2.131> Codec G711u
Analysis
Both sides use G.711 for the entire fax session.
Example 6-2 Fax Pass-through Mode
---------- 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
Analysis
• Both sides initially use G.723.
• <2.116> switches to G.711µ-law using a dynamic payload type.
• NSE signaling packets are sent from <2.116>.
• An optional NE signaling packet is sent from <2.213>.
• <2.113> switches to G.711µ-law using a dynamic payload type.
Note EVT 193 may not appear for some fax transmission.
Example 6-3 Fax Pass-through Mode
---------- FAX Summary 1 ----------
[ 37]<3.200=>2.53> Codec G723
[ 41]<2.53=>3.200> Codec G723
[ 136]<3.200=>2.53> Codec G711u/D
[ 137]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 140]<2.53=>3.200> Codec G711u/D
Analysis
• Both sides initially use G.723.
• <3.200> switches to G.711µ-law using a dynamic payload type.