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

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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

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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.

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 Cisco ATA Configuration Failure

 

----------

FAX Summary 1 ----------

 

 

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)

 

 

 

 

 

 

OL-3410-01

 

 

7-17

 

 

 

 

 

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Cisco Systems 186, 188 manual Using rtpcatch to Analyze Common Causes of Failure, Example 7-4 T38 Fax Relay Mode