I am not sure if cisco IOS supports hairpin traffic, but I think that's your problem. It doesn't show "supported" in http://www.ietf.org/internet-drafts/draft-jennings-midcom-stun-results-02.tx t.

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From: Raymond Chen [mailto:rchen@cityabove.net] Sent: Tuesday, January 18, 2005 5:45 PM To: 'Richard' Cc: serusers@lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT

There is not firewall, we use cisco 7507 to perform NAT.

Ray

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From: Richard [mailto:richard@o-matrix.org] Sent: Wednesday, January 19, 2005 11:41 AM To: 'Raymond Chen' Cc: serusers@lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT

What firewall do you have?

Your firewall probably has problems to support hairpin traffic.

Richard

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From: Raymond Chen [mailto:rchen@cityabove.net] Sent: Tuesday, January 18, 2005 4:56 PM To: 'Richard' Cc: serusers@lists.iptel.org Subject: RE: [Serusers] multiple SIPURA behind same NAT

We use SIPURA 2000 and rtpproxy. I have attached the sip message log.

Ray

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From: Richard [mailto:richard@o-matrix.org] Sent: Wednesday, January 19, 2005 10:27 AM To: 'Raymond Chen' Cc: serusers@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

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From: serusers-bounces@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@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

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From: Matt Schulte [mailto:mschulte@netlogic.net] Sent: Tuesday, January 18, 2005 9:08 AM To: Raymond Chen; serusers@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@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