SIP dropouts? how do they sound?

[Peter]

This may sound odd but I have large banging noises in SIP connections over not
so good lines. I thought there should only be drop-outs but it turns out there
are huge banging noises when this happens. I have some idea about why this
happens but I would like to know what other have seen. Most of the communication
is between Linux hosts and SIP softphones on Linux and Windows based remote 
parties.

thanks,

  Peter

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