[asterisk-users] Calls Dropping

[Dan Journo]

Hi,

I'm having a major problem with random calls dropping. After spending weeks trying to figure it out, i've finally spotted the issue but don't know how to resolve it.

I run a sip server that's hosted in a data centre. It has a public IP address with no nat involved. My provider also has a public ip with no nat involved.

The sip phones are in a remote office behind a nat router.

Every so often, all the rtp data coming from the remote location stops arriving at my sip server.
So after about 30 seconds, the call gets terminated by my provider because i'm not sending any rtp packets to them.

Any ideas why the rtp data should stop coming in, and how can I resolve it?

Asterisk v1.4.30
6 x Linksys SPA921
Router at remote site is a Thomson TG585v7

Any assistance will be greatly appreciated.
Many thanks
Dan
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