Cisco ATA 186 Administrator's Manual page 140

Debugging the Cisco ATA 186/188 Fax Services
Table 7-2
Log event
[ch] Enable encoder <pt>
[ch] DPKT 1st:
<timestamp1>
<timestamp2>, pt <pt>
[ch] codec: <pt1> => <pt2> Voice codec switchover occurred. The voice encoder type switched from
[ch] Rx MPT PT=<NSEpt>
NSE pkt <event>
[ch] Tx MPT PT=<pt> NSE
pkt <event>
Debugging FAX Pass-through Mode
When the Cisco ATA is configured to use fax pass-through mode, the fax call session can be established
with an arbitrary voice codec. Once the voice call has been established, fax machines can signal their
presence by means of a CED tone or V.21 preamble flag, after which the gateways send NSE packets to
initiate switchover.
For fax pass-through mode, check the Cisco ATA debug log to verify that it is acting as an originating
Note
gateway as well as a terminating gateway.
Terminating-Gateway Example
When the Cisco ATA is used as a terminating gateway for a fax session, make sure the following
conditions are true:
•
•
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (H.323)
7-10
Debug Log Examples
The Cisco ATA transmits CED-tone-event NSE packets.
The encoder switchover to G.711 occurs during the NSE-packet transaction.
Description
Voice encoder type pt is enabled for the channel ch, where pt can be 0
for G.711µ-law, 4 for G.723.1, 8 for G.711A-law, and 18 for G.729.
For example,
[0]Enable encoder 4
transmitted G.723.1-encoded voice packets.
The first voice packet that the Cisco ATA received was of RTP payload
type pt for the channel ch with timestamp of timestamp1, and the local
decoding timestamp was set to timestamp2.
For example,
[0]DPKT 1st: 1491513359 1491512639, pt 4
that the first RTP packet that the Cisco ATA received was
G.723.1-encoded for channel 0.
pt1 to pt2 for the channel ch.
For example,
[0]codec: 4 => 0
on the Cisco ATA switched from G.723.1 to G.711µ-law.
Channel ch received an NSE packet of event with payload type of NSEpt.
For event, c0XXXXXX indicates a CED tone event, and c1XXXXXX
indicates a phase reversal event.
For example,
[0]Rx MPT PT=100 NSE pkt c0000000
Cisco ATA received a CED tone event NSE packet with payload type of
100.
Channel ch transmitted an NSE packet of event with payload type of
NSEpt. For event, c0XXXXXX indicates a CED tone event, and
c1XXXXXX indicates a phase reversal event.
For example,
[0]Tx MPT PT=100 NSE pkt c0000000
ATA transmitted a CED tone event NSE packet with payload type of
100.
Chapter 7 Configuring and Debugging Fax Services
indicates that the Cisco ATA
indicates that the local voice encoder
indicates that the
indicates that the
indicates
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