7-10
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for H.323 (version 3.0)
OL-4804-01
Chapter 7 Configuring and Debugging Fax Services
Debugging the Cisco ATA 186/188 Fax Services
As prserv receives debug information from the Cisco ATA, it displays the information on the DOS screen
and saves it to the output file <port>.log.
Once you are finished capturing debug information, you can stop prserv by entering Ctrl-C at the DOS
prompt. If you restart the process without changing the name of the log file, any new debug information
is appended to the end of the original file.
Analyzing prserv Output for Fax Sessions
The debug log obtained from
prserv
is for detecting simple configuration problems.
Note
A comprehensive understanding of the fax events requires the use of the
rtpcatch
tool (see the
“Using
rtpcatch for Diagnosing Fax Problems” section on page 7-12
).
Table 7-2
lists log events relevant to analyzing a fax session.
Table 7-2
Debug Log Examples
Log event
Description
[
ch
] Enable encoder <
pt
>
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
indicates that the Cisco ATA
transmitted G.723.1-encoded voice packets.
[
ch
] DPKT 1st:
<
timestamp1
>
<
timestamp2
>, pt <
pt
>
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
indicates
that the first RTP packet that the Cisco ATA received was
G.723.1-encoded for channel 0.
[
ch
] codec: <
pt1
> => <
pt2
>
Voice codec switchover occurred. The voice encoder type switched
from
pt1
to
pt2
for the channel
ch
.
For example,
[0]codec: 4 => 0
indicates that the local voice encoder
on the Cisco ATA switched from G.723.1 to G.711µ-law.
[
ch
] Rx MPT PT=<
NSEpt
>
NSE pkt <
event
>
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
indicates that the
Cisco ATA received a CED tone event NSE packet with payload type of
100.
[
ch
] Tx MPT PT=<
pt
> NSE
pkt <
event
>
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
indicates that the
ATA transmitted a CED tone event NSE packet with payload type of
100.
