We are facing a voice quality probem in our voip solution using CUCM 8.6 and AS5400 GWs;
Some PSTN calls using PRI lines are experiencing very bad quality.(1 call per 50 more or less)
The called number can be mobile or landline, and i can know that the call will have this problem even before the call is established, just hearing the ringback tone (Distorsion). Sometimes i can also hear third party conversation mixed up with my call .
All the serial interfaces and controllers are error free.
The same problem when i use a second AS5400 located on a different datacenter.
The architecture is as follow:
Has anyone else faced the same issue /sympthoms?
Thanks in advance