Using Rtpcatch To Analyze Common Causes Of Failure - Cisco ATA186-I2 Administrator's Manual

Debugging the Cisco ATA 186/188 Fax Services
Analysis
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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.
Example 7-6
---------- FAX Summary 1 ----------
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[
Analysis
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Possible Causes for Failure
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Example 7-7
---------- FAX Summary 1 ----------
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[ 1820]<2.53=>3.200> NSE PT
[ 1966]<2.53=>3.200> NSE PT
Analysis
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Possible Cause for Failure
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Example 7-8
---------- FAX Summary 1 ----------
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[ 106]<3.200=>2.53> Codec G711u/D
[ 107]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
7-18
Both sides initially use G.711µ-law.
NSE signaling packets are sent between <2.53> and <3.99>.
Both sides switch to Cisco fax relay.
Cisco ATA Configuration Failure
37]<2.53=>3.200> Codec G723
39]<3.200=>2.53> Codec G723
<2.53> is the originating gateway and <3.200> is the terminating Cisco ATA.
The Cisco ATA and the <2.53> gateway use G.723 codec.
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.
Fax Mode Failure
37]<2.53=>3.200> Codec G711
39]<3.200=>2.53> Codec G711
<2.53> is the originating gateway and <3.200> is the terminating 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.
Cisco fax relay option is not disabled on the gateway.
Fax Pass-through Mode Failure
2]<2.53=>3.200> Codec G723
4]<3.200=>2.53> Codec G723
96, Cisco Fax Relay
96, Cisco Fax Relay
Chapter 7 Configuring and Debugging Fax Services
OL-4804-01