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Cisco Systems 186 Manual Do Utilizador

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7-19
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
OL-3410-01
Chapter 7      Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
Example 7-9
Fax Pass-through Mode Failure
---------- FAX Summary 1 ----------
[   37]<2.53=>3.200> Codec G723
[   39]<3.200=>2.53> Codec G723
[  143]<3.200=>2.53> Codec G711u/D
[  144]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 1602]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[ 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 G.711µ-law and sends G.711 upspeed NSE signaling packets.
•
The <2.53> gateway upspeeds to G.711µ-law and then sends Cisco fax relay event packets.
Possible Cause for Failure
•
Cisco fax relay option is not disabled on the gateway.
Example 7-10
Fax Pass-through Mode Failure
---------- FAX Summary 1 ----------
[   33]<3.200=>2.53> Codec G729
[   39]<2.53=>3.200> Codec G729
[  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
[  568]<2.53=>3.200> NTE PT 101, EVT  34: Modem Mode, ANSam tone Detected (RFC2833)
[  580]<3.200=>2.53> Codec G711u/D
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 G.711µ-law.
•
<3.200>The Cisco ATA switches to G.711µ-law also, but never sends NTE signaling packets.
•
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, G.711µ-law, G.723, G.729, T.38, Cisco fax relay, modem 
pass-through with or without redundancy packets, RTCP packets and NSE packets.