Troubleshooting guide

Troubleshooting Guide
112
Ring is not heard immediately
when external phone calls on
LS trunk.
An external phone that is
connected to the LS trunk
rings four times before the
receiving phone rings. When
the class of service option
ANI/DNIS Delivery Trunk is
enabled, the system waits for
the ANI information before
making the phone ring. If this
is not provided, the phone will
not ring immediately.
In the COS of the LS trunk, disable ANI/DNIS
Delivery Trunk.
Poor audio quality on LS
trunks
Incorrect country loss level
plan.
In the License and Option Selection form,
ensure that the Country field is set correctly for
the system. The Country setting determines
the default language, dialing plan, tone plan,
and loss and level plan for the system.
Refer to the Hardware Technical Reference
Manual for tables that list the Loss Level Plans.
You can also check with the Mitel Regional
Sales office to find out the most appropriate
setting for your region.
Incorrect Balanced Network
Setting or Trunk Category in
the Trunk Circuit Descriptor
form for the trunk.
Use the Line Quality Measurement tool in the
System Administration Tool to determine the
correct settings.
Inadequate system grounding Ensure that the “Protective Ground” on the
rear panel of the controller, ASU, or Peripheral
Cabinet is connected to a solid ground. Refer
to Appendix B in the Hardware Technical
Reference Manual for additional grounding
information.
Poor audio quality occurring
intermittently on LS trunks.
If incoming calls arrive from
trunks that are members of a
trunk hunt group, an audio
quality problem on a trunk in
the group will appear as an
intermittent problem on the
phones.
Use the Line Quality Measurement tool in the
System Administration Tool to check the
settings of each LS trunk in the hunt group.
Caller is using a cell phone
that does not support the
International Telephone
Union (ITU-T)
recommendation for the Send
Loudness Rating (SLR).
If the caller is using a cell phone that has a low
SLR, a user on the system will receive low
audio. This is an issue with the caller’s cell
phone.
Table 33: Troubleshooting Analog Trunks
Symptom Possible Cause Corrective Action
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