[asterisk-users] Play "blank" sound while VM recording?

[Philipp Kempgen]

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

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