12 Sp+ troubleshooting

[DHOUHA BEN HAMZA]

Hi,

I have some IP Phone 12 SP+ configure with Cisco Callmanager the version 3.3 2 Sp (B). My Problem it presents as the following:

The IP Phone (12 SP+) receives a call, when the user pick up a phone to answer the only thing which he can hear it’s a ring (no conversation can be establish, he hears only a ring).

I have this problem only with Cisco 12 SP+ IP Phone Model.

Best Regards

[irisrios]

It could be due to codec mismatch. Similar problem was solved by using G711 codec on the Voice gateway. by default it could be G729r8. Changing it to G711 should work.