This is typical, for example, when calls are currently on hold. When using MoH, there is only an audio stream from the MoH server to the gateway, not in the reverse direction. Therefore, the gateway shows 0.0.0.0 because it does not transmit packets to any IP address during that time.
Your post was very helpful. Although, I don't think this are on hold calls because I have too many of them and they just wont disappear. I have reloaded the GW but the are still there. Here I copy the output of the command sh voip rtp connections
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...