Charles Ulrich wrote:

> I have an Asterisk system deployed at a customer's site. It is connected 
> to the outside world by a local SIP provider. When someone calls in 
> through the trunk to leave a voicemail, Asterisk is not sending any RTP 
> packets back through the trunk after the beep is played. This is fine 
> and probably should be the expected behavior, except that after 30 
> seconds to a minute of not seeing any RTP traffic coming from the PBX, 
> the trunk appears to make the faulty assumption that the PBX is gone 
> and hangs up the call.

Maybe this is what you need?:

;rtpkeepalive=<secs>            ; Send keepalives in the RTP stream to keep NAT 
open
                                ; (default is off - zero)
(in sip.conf, [general] section)

Regards,
  Philipp

-- 
amooma GmbH - Bachstr. 126 - 56566 Neuwied - http://www.amooma.de
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