Symptom
Sometimes, a phone connected to the IAD does not ring for incoming calls. Users can use the phone to make outgoing calls.
Cause
The possible causes are as follows:
•The phone model is not supported.
•PCs connected to the IAD affect the voice service.
Solution
1.Replace the phone with a phone of another model, and check whether the fault is rectified.
1.If yes, the phone model is not supported. Replace the phone.
2.If no, go to 2.
2.Compare signaling streams and check whether the signaling stream is normal when the fault occurs.
1.If yes, go to 3.
2.If no, locate the fault based on the abnormal signaling.
