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Cisco BTS 10200 Softswitch Troubleshooting Guide, Release 5.0.x
OL-8723-19
Chapter 15 Diagnostic Tests
Troubleshooting Using Snoop
H.323 Protocol (H323) example:
10.0.0.1 is an H323 gateway. 10.0.0.129 is an H323 gatekeeper. Our goal is to monitor both Registration,
Admissions, and Status (RAS) and H.225 messaging.
a.
First, find the RAS port number and the H.225 port number.
CLI>show h323-gw
ID=ccm3_gw1
STATUS=INS
OPER_STATUS=NF
GW_H225_PORT=1720 <----------- this port
TGN_ID=4441
SECURITY=N
H245_TUNNELING=DEFAULT
TCP_MAX_LIMIT=5
TCP_MAX_AGE=30
MAX_VOIP_CALLS=65535
HIGH_WATER_MARK=0
LOW_WATER_MARK=0
IRR_BANDWIDTH_SUPP=N
IPTOS_SIG_LOWDELAY=Y
IPTOS_SIG_THROUGHPUT=N
IPTOS_SIG_RELIABILITY=N
IPTOS_SIG_PRECEDENCE=FLASH
BRQ_SUPP=Y
ANNEXE_RETRANSMIT_TIMER=500
ANNEXE_RETRANSMIT_MULTIPLIER=2
ANNEXE_RETRANSMIT_ATTEMPTS=8
CALL_START_MODE=FAST_START
ANNEXE_SUPP=N
ANNEXR_SUPP=N
STATUS_ENQ_TIMER=4
CODEC_NEG_TIMER=200
CODEC_NEG_ATTEMPTS=4
SOURCE_BASED_ROUTING=NONE
CLI>show h323-gw2gk
H323_GW_ID=ccm3_gw1
GK_ID=Metro-GK
PRIORITY=0
GK_IP_ADDR=10.0.0.129
GK_RAS_PORT=1719 <------------ this port
MULTICAST=N
TIME_TO_LIVE=60
# snoop -d qfe0 -o h323.cap host 10.0.0.1 and port 1720 or host 10.0.0.129 and port
1719
b.
Use Control-C to stop the packet capture. Open the file in Ethereal and inspect.