Problem Report Tool - Cisco ATA 191 Administration Manual

Problem Report Tool

Table 10: ATA 191 Troubleshooting
Summary
Poor quality when calling mobile
phones using the G.729 protocol
Prolonged broadcast storms cause
phones to reset, or be unable to
make or answer a call.
Dual-Tone Multi-Frequency
(DTMF) delay
Codec mismatch between the
phone and another device
Sound sample mismatch between
the phone and another device
Gaps in voice calls
One-way audio
Phone call cannot be established.

Problem Report Tool

To issue a problem report, press the PRT button on the ATA.
Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager
52
Explanation
In Cisco Unified Communications Manager, you can configure the
network to use the G.729 protocol (the default is G.711). When using
G.729, calls between a phone and a mobile phone have poor voice
quality. Use G.729 only when absolutely necessary.
A prolonged Layer 2 broadcast storm (lasting several minutes) on the
voice VLAN may cause phones to reset, lose an active call, or be unable
to initiate or answer a call. Phones may not come up until a broadcast
storm ends.
When you are on a call that requires keypad input, if you press the keys
too quickly, some of them may not be recognized.
The RxType and the TxType statistics show the codec that is being used
for a conversation between this ATA and the other device. These values
should match. If they do not, verify that the other device can handle the
codec conversation or that a transcoder is in place to handle the service.
The RxSize and the TxSize statistics show the voice packet sizes that
are being used in a conversation between this ATA and the other device.
The values of these statistics should match.
Check the AvgJtr and the MaxJtr statistics. A large variance between
these statistics may indicate a problem with jitter on the network or
periodic high rates of network activity.
When at least one person in a call does not receive audio, IP connectivity
between phones is not established. Check the configurations in routers
and switches to ensure that IP connectivity is properly configures.
The phone does not have a DHCP IP address and is unable to register
with Cisco Unified Communications Manager.
Verify the following:
1 The Ethernet cable is attached.
2 The Cisco Unified Communications Manager service is running on
the Cisco Unified Communications Manager server.
3 Both phones are registered to the same Cisco Unified
Communications Manager.
Troubleshoot and Maintenance