Cisco ATA-186 Administrator's Manual page 148

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:
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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
Analysis
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EVT 193 may not appear for some fax transmission.
Note
Example 7-3
---------- FAX Summary 1 ----------
[
[
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP)
7-16
– 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)
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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
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.
Fax Pass-through Mode
37]<3.200=>2.53> Codec G723
41]<2.53=>3.200> Codec G723
Chapter 7 Configuring and Debugging Fax Services
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