
Chapter 7 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
Example 7-9 Fax Pass-through Mode Failure
[ | 37]<2.53=>3.200> | Codec G723 |
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[ | 39]<3.200=>2.53> | Codec G723 |
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[ | 143]<3.200=>2.53> | Codec G711u/D | |||
[ | 144]<3.200=>2.53> | NSE | PT 100, | EVT 192: | |
[ 1602]<3.200=>2.53> | NSE | PT 100, | EVT 192: | ||
[ 1604]<2.53=>3.200> | Codec G711u/D | ||||
[ 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 terminating Cisco ATA.
•The Cisco ATA upspeeds to
•The <2.53> gateway upspeeds to
Possible Cause for Failure
•Cisco fax relay option is not disabled on the gateway.
Example 7-10 Fax Pass-through Mode Failure
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[ | 33]<3.200=>2.53> | Codec G729 |
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[ | 39]<2.53=>3.200> | Codec G729 |
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[ | 562]<2.53=>3.200> | NTE | PT 101, EVT | 34: Modem Mode, ANSam tone Detected (RFC2833) |
[ | 563]<2.53=>3.200> | NTE | PT 101, EVT | 34: Modem Mode, ANSam tone Detected (RFC2833) |
[ | 565]<2.53=>3.200> | NTE | PT 101, EVT | 34: Modem Mode, ANSam tone Detected (RFC2833) |
[ | 566]<2.53=>3.200> | Codec G711u/D |
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[ | 568]<2.53=>3.200> | NTE | PT 101, EVT | 34: Modem Mode, ANSam tone Detected (RFC2833) |
[ | 580]<3.200=>2.53> | Codec G711u/D |
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Analysis
•<3.200> is the originating Cisco ATA, and <2.53> is the terminating gateway.
•Both sides initially use G.729.
•<2.53> gateway sends NTE signaling packets, then upspeeds to
•<3.200>The Cisco ATA switches to
•Fax transmission fails because <2.53> gateway does not receive any NTE packets, and it drops the fax call.
Possible Cause for Failure
•The Cisco ATA does not support the NTE signaling method and requires that the gateways use the NSE signaling method.
rtpcatch Limitations
•rtpcatch performs optimally when analyzing capture files containing only one VoIP session.
•rtpcatch detects only G.711A,
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
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