We use SIPURA 2000 and rtpproxy. I have attached the sip message log. Ray _____ From: Richard [mailto:richard@o-matrix.org] Sent: Wednesday, January 19, 2005 10:27 AM To: 'Raymond Chen' Cc: serusers(a)lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT What nat device do you have? Does it have any sip helper module? Are you running rtpproxy? It will be helpful if you can send a sip packet dump. Richard _____ From: serusers-bounces(a)iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Raymond Chen Sent: Tuesday, January 18, 2005 2:59 PM To: 'Matt Schulte' Cc: serusers(a)lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT Matt, Both port use different sip port, and can make calls at the same time. But still can't get voice when call to each other. Raymond _____ From: Matt Schulte [mailto:mschulte@netlogic.net] Sent: Tuesday, January 18, 2005 9:08 AM To: Raymond Chen; serusers(a)lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT If I had a guess I would say either the NAT or rtp/media proxy is getting confused about which client is which. Ignoring the problem for a second, can both sipura's make calls at the same time? Are you using NAThelper for this with SER? You mentioned "without proxy", this would mean port forwarding? Try this, make each sipura use a diff range of RTP ports (in their config). Matt -----Original Message----- From: Raymond Chen [mailto:rchen@cityabove.net] Sent: Monday, January 17, 2005 12:25 PM To: serusers(a)lists.iptel.org Subject: [Serusers] multiple SIPURA behind same NAT Dear all, I have two sipura box behind NAT. both use via header and can dial out and received calls without proxy. but they have no voice when they call to each other, any idea? Raymond