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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
Chapter7 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
Using rtpcatch to Analyze Common Causes of Failure
The following examples show the rtpcatch output of failed fax sessions. <3.200> is ATA; <2.53> is a
Cisco gateway.
Example7-6 Cisco ATA Configuration Failure
---------- FAX Summary 1 ----------
[ 37]<2.53=>3.200> Codec G723
[ 39]<3.200=>2.53> Codec G723
Analysis
•<2.53> is the originating gateway and <3.200> is the termin ating Cisco ATA.
•The Cisco ATA and the <2.53> gateway use G.723 codec.
Possible Causes for Failure
•The Cisco ATA is not configured with fax mode or fax pass-through mode.
•If the Cisco ATA is the gateway for a fax sender, the remote gateway is not configured with fax
pass-through mode.
Example7-7 Fax Mode Failure
---------- FAX Summary 1 ----------
[ 37]<2.53=>3.200> Codec G711
[ 39]<3.200=>2.53> Codec G711
[ 1820]<2.53=>3.200> NSE PT 96, Cisco Fax Relay
[ 1966]<2.53=>3.200> NSE PT 96, Cisco Fax Relay
Analysis
•<2.53> is the originating gateway and <3.200> is the termin ating Cisco ATA.
•The Cisco ATA and the <2.53> gateway begin with G.711 codec.
•The <2.53> gateway sends Cisco fax relay event packets.
Possible Cause for Failure
•Cisco fax relay option is not disabled on the gateway.
Example7-8 Fax Pass-through Mode Failure
---------- FAX Summary 1 ----------
[ 2]<2.53=>3.200> Codec G723
[ 4]<3.200=>2.53> Codec G723
[ 106]<3.200=>2.53> Codec G711u/D
[ 107]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 1436]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
Analysis
•<2.53> is the originating gateway, and <3.200> is the terminating Cisco ATA.
•The Cisco ATA upspeeds to G.711µ-law and sends G.711 upspeed NSE signaling packets.
•The <2.53> gateway does not respond to the NSE signaling packets.