SIP trunk drops inbound calls after 10 sec

JPP1962

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Jan 17, 2009
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#1
Hello

I just setup a sip trunk to a provider and I can make calls without problem. I receive calls but they look like in "demo mode" after 10 seconds the call is dropped.

I have searched and searched and couldn't find out why. I think it must have something to do with NAT (firewall ports are open and I have no sound problems)

here is a simple diagram of my network


I also did a sip debug on my Elastix box but (I'm no Asterisk guru :( ) but couldn't understand it. I see the INVITE from the provider, but I can't figure out the reason why there is no answer.

My setup: Elastix 1.6; Zoiper soft phone and Siemens Gigaset A580IP.
sip_nat.conf
extern_ip =
localnet = 10.0.0.0/24

Attached is an output of my CLI where there is the SIP trunk config and the SIP debug of an incoming call.
http://forum.elastix.org/old_files/InboundCallsem.txt

Any ideas where to look, what to ask to the provider are more highly appreciated.

JPP
 

rphenix

Joined
Feb 25, 2009
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#2
Have you tried working out the IP(s) from the provider and temporarily forwarding all traffic to your PBX (i.e. unblock everything).

Also its been my experience to leave sip_nat.conf blank.
 

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