Page 7-66
Troubleshooting
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
IP Networking Issues
No audio on network calls Two NATs or firewalls are
present in the path.
Remove the NATs/firewalls. The IPRC cannot work
behind firewalls or use NATs. See page 2-94 for
details.
The audio stream receive
ports are not programmed
correctly.
Make sure the audio stream ports fields match for
the affected nodes. See page 6-177 for details.
The IPRC is faulty. Replace the faulty IPRC.
Phone display shows
INSUFF BANDWIDTH FOR
VOICE
The Ethernet cable came
unplugged from the IPRC
and/or data network (i.e.,
hub) during a call.
Make sure the Ethernet cable is plugged into the
IPRC and data network.
The data network does not
meet the minimum specifica-
tions required for IP network-
ing.
Run the Network Qualifier to assess your data net-
work. Then verify that your data network meets the
minimum specifications (see page 2-94 for more
information).
The data network is experi-
encing problems (e.g., exces-
sive packet loss and traffic).
Contact your network administrator.
One-way audio on network
calls
A NAT or firewall is present
in the path.
Remove the NAT/firewall. The IPRC cannot work
behind firewalls or use NATs. See page 2-94 for
details.
The audio stream receive
ports are not programmed
correctly.
Make sure the audio stream ports fields match for
the affected nodes. See page 6-177 for details.
Poor call quality on network
calls
The data network is experi-
encing problems (e.g., exces-
sive packet loss and traffic).
Contact your network administrator.
The data network does not
meet the minimum specifica-
tions required for IP network-
ing.
Run the Network Qualifier to assess your data net-
work. Then verify that your data network meets the
minimum specifications (see page 2-94 for more
information).
The G.711 vocoder is using
too much bandwidth.
Switch to a G.729 vocoder, which uses less band-
width.
The G.729 vocoder is com-
pressing audio data, resulting
in poorer quality.
Switch to a G.711 vocoder, which does not com-
press audio data, resulting in higher call quality.
DTMF tones are not detected DTMF tone length is too
short.
Set the DTMF Digit Duration/Pause field to 100ms
or higher (see page 6-331).
The wrong DTMF vocoder is
programmed.
Make sure the DTMF Encoding field is set to either
G.711 or RFC2833 (see page 6-186).
The network is experiencing
audio and/or connection
problems
There is a port conflict or the
firewall, NAT, or router is
blocking the port.
Try changing the ports associated with IP call con-
trol and/or audio. Make sure none of them conflict
with ports that other protocols use (e.g., SIP uses
5060).
Cannot fax across the net-
work
Currently the IPRC does not support faxing over the IP network.
Table 7-21. IP Networking Troubleshooting Chart (Continued)
Symptom Possible Cause Corrective Action
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