Cisco ATA 188 Administrator's Manual page 105

Chapter 6 Configuring and Debugging Fax Services
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Example 6-4
---------- FAX Summary 1 ----------
[
[ 486]<3.99=>2.53> Codec G711u
[ 1277]<3.99=>2.53> Codec T38
[ 1278]<2.53=>3.99> Codec T38
Analysis
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Example 6-5
---------- FAX Summary 1 ----------
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[ 248]<3.99=>2.53> Codec G711u
[ 798]<2.53=>3.99> NSE PT 96, Cisco Fax Relay
[ 799]<3.99=>2.53> NSE PT 97, EVT 192: Up-Speed, CED tone Detected
[ 800]<2.53=>3.99> NSE PT 97, Cisco Fax Relay ACK
[ 801]<2.53=>3.99> Codec C_FxRly
[ 803]<3.99=>2.53> NSE PT 96, EVT 192: Up-Speed, CED tone Detected
[ 804]<2.53=>3.99> NSE PT 97, Cisco Fax Relay ACK
[ 805]<3.99=>2.53> Codec C_FxRly
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 6-6
---------- FAX Summary 1 ----------
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[
Analysis
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Possible Causes for Failure
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Ol-3141-01
NSE signaling packets are sent from <3.200>.
<2.53> switches to G.711µ-law using a dynamic payload type.
T38 Fax Relay Mode
15]<2.53=>3.99> Codec G711u
Both sides initially use G.711µ-law.
Both sides switch to T.38
Cisco Fax Relay
8]<2.53=>3.99> Codec G711u
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.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SCCP)
Debugging the Cisco ATA 186/188 Fax Services
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