Troubleshooting Vofr; Poor Vofr Quality - HP FlexNetwork MSR Series Configuration Manual

Troubleshooting VoFR

Call failure in Huawei-compatible mode
Symptom
Calls cannot be connected in Huawei-compatible mode.
Analysis
In the Huawei-compatible mode, calls can be connected only when the frame relay is normal, voice
entities are configured correctly, and a sufficient bandwidth is reserved for voice.
Solution
•
Use the display interface serial command to check that frame relay is correctly configured on
the two sides.
•
Check that the protocols of X.25 over frame relay work correctly. Use the display fr pvc-info
command to check the status of X.25 and LAPB or use the display x25 vc command to check
whether X.25 VC is congested.
•
Check that a voice bandwidth has been reserved for the corresponding DLCI. Check that a
frame relay class is configured for the DLCI and that a voice bandwidth is configured for the
frame relay class.
•
Check that the voice entities are correctly configured.

Poor VoFR quality

Symptom
The VoFR quality is poor.
Analysis
A high VoFR quality requires sufficient bandwidth.
Solution
•
Check that the physical bandwidth of frame relay is sufficient (10 kbps in accordance with
G.729 and 9 kbps in accordance with G.723).
•
Check that a fragment size is configured for all DLCIs on the same interface and that the
fragment size is small enough. Use the debugging fr fragment interface serial command to
view the packet fragment size.
327