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IP Telephony and QSIG Over IP
CTX IP Troubleshooting
Strata CTX I&M 06/04 9-37
IP Telephony and QSIG
Over IP
3
IPT has harsh noise
during talking or hearing
any tone.
Check the network equipment
located on the routing path
between BIPU and IPT.
Repeater HUB was used.
Replace to Switching HUB.
Toshiba recommends the
use of SW-HUB.”
“Capture the network traffic
between BIPU and IPT, and
analyze the captured data.
Verify the following.
(1)The interval of RTP packets is
almost same as the value
configured by Prog 152-FK1.
(2)This interval is constant.
Path band-width of the
network between BIPU and
IPT was too narrow.
Reduce the number of
connected IPTs.
Apply the priority control.
Change voice CODEC to
G.729A”
Routing delay or packet loss
due to low performance of
routing devices (router or L3
switch).
Same as above.
“Illegal packets were sent to
BIPU/IPTs. Flow a lot of
broadcast packets.”
Remove the originator.
LAN Problems:
4
“IPT is unable to connect
to BIPU.
Condition:
Two repeater HUBs were
cascaded.”
Verify the specification of each
repeater HUB.
10M-repeater HUB and 10/
100M-repeater HUB were
cascaded.
In case that some repeater
HUB connects to the other
one having different link
speed each other, one of
those needs to have internal
bridge circuit.
5 No voice path
“If priority control function
(IEEE802.1p) was set to
““enable””, return to ““disable””
and try again. If voice path was
restored, verify the specification
of routers/switches between
BIPU and IPT.”
“Routers or LAN switches
were unable to interpret
Ethernet frame with VLAN
tag correctly (IEEE802.1p
uses a part of VLAN tag
field). So, these frames were
discarded by the router/
switch.”
Disable IEEE802.1p
function. *note) Equipment
not to be complied with
IEEE802.1Q/1p seem to
regard ethernet frames with
VLAN tag field as illegal
frames and to discard these
frames.
6
“IPT is unable to connect
to BIPU.
Condition:
IPT connects to LAN
switch complied with
IEEE802.1Q (tag-based
VLAN).”
Check the port configuration of
LAN switch.
The IPT connection port was
configured as tag-based
VLAN port. Therefore, this
port passed only ethernet
frames with VLAN-ID same
as port configuration, and
discarded other frames.
Disable VLAN setting. IP-
CTX does not support tag-
based VLAN. So, BIPU and
IPT cannot belong any
VLAN.
7
There are two gateways
in the network segment
which BIPU belongs, and
one of them is configured
as default gateway of
BIPU.
- restriction
If default gateway is down
for a while, BIPU cannot re-
route another gateway
automatically.
8
IPT Problems:
“IPT shows ““Can’t set
IPaddress””.”
Check the DHCP server exists
on the same network as that IPT.
DHCP server does not exists
on the network.
Setting up and starting
DHCP service, or configure
IPT’s IP address and Subnet
mask manually.
DHCP server is located
beyond the router.
Setting up and starting
DHCP service on the same
network as that IPT.
Table 9-10 IP Troubleshooting Problems and Resolutions
(continued)
No. Problem Action Cause How to Resolve