[asterisk-users] Audio dropping

[Roger Burton West]

On Fri, May 27, 2011 at 10:31:57AM +0200, Mark Scholten wrote:

>What could the reason be audio in 1 direction is dropping? (Normally from
>the Asterisk server to the mentioned SIP clients.) No clear information is
>in the logs (it is like the call ended normally) and not all calls are
>having problem (most not, but it happens to often for us to start using VoIP
>more at the moment).

While the most usual problem is packet filtering / NAT, this generally
manifests as no audio at all in one direction, not a drop in mid-call.
But it's possible that one of the intermediate transit providers is
doing something "clever". (Disabling ping, as you mention in your later
email, is often a good indicator of a company with insufficient Clue.)

Are you in a position to tunnel the traffic over a VPN or similarly flat
and unfilterable network link? (This might be a good idea anyway.)

Roger