We have a problem on our voice network, the voice quality for phone 7937G is not good.
Ou network is fully configured to categorized voice with DSCP 34 (AF41) and Cos 5 (Binary 101). We did some traces and test see below:
We sniffed the voice traffic of phone 9951 (work fine) and 7937G
- 9951 --> DSCP 34 (AF41) and Cos 5 (Binary 101) --> voice quality accros wan is excellent.
- 7937G --> DSCP 34 (AF41) and Cos 4 (Binary 100) --> quality not good enough.
Could explain me why the Cos value is different for these kind of phone ? In the enterprise parameters, all is set for DSCP 34.
Could you help me on this ?