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Cisco Systems ATA 188 Manual De Usuario

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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)
OL-4008-01
Chapter 7      Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
[  136]<3.200=>2.53> Codec G711u/D
[  137]<3.200=>2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected
[  140]<2.53=>3.200> Codec G711u/D
Analysis
•
Both sides initially use G.723.
•
<3.200> switches to G.711µ-law using a dynamic payload type.
•
NSE signaling packets are sent from <3.200>.
•
<2.53> switches to G.711µ-law using a dynamic payload type.
Example 7-4
T38 Fax Relay Mode
---------- FAX Summary 1 ----------
[   15]<2.53=>3.99> Codec G711u
[  486]<3.99=>2.53> Codec G711u
[ 1277]<3.99=>2.53> Codec T38
[ 1278]<2.53=>3.99> Codec T38
Analysis
•
Both sides initially use G.711µ-law.
•
Both sides switch to T.38
Example 7-5
Cisco Fax Relay
---------- FAX Summary 1 ----------
[    8]<2.53=>3.99> Codec G711u
[  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
•
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.