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Arcesilaus

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  1. Thank you for your reply. I am currently using a site-to-site VPN with Netscreen devices at both sides. That should mean that per definition there is Split tunneling: only the traffic to the Axon server should go through the tunnel, everything else goes unencrypted directly to its own gateway. As soon as the SIP routing has been done by Axon, the client should setup a connection directly with the intended recipient of the call, using its own untunneled connection. However, since its routing instructions come from Axon, hence through the tunnel, it will continue to use the same SIP session to Axon and try to setup only the RTP session with the recipient. And that is exactly where it goes wrong: the SIP signal is still going through the tunnel (routed by Axon) whereas the RTP session is not using the tunnel. It seems impossible to have both sessions linked again. I tried to solve the problem by installing the Recording software, that turns the Axon PBX into a RTP-proxy. However, I still have the same problem: even when the RTP traffic goes through the tunnel, it is not recognized as being in conjunction with the SIP session that is also using the tunnel. I therefore tend to suspect the firewall from causing the problem. If anyone has any idea or suggestions, please let me know.
  2. Hi To avoid opening ports on my firewall, I use the Application Layer Gateway for SIP to solve the NAT problem connecting Axon to my SIP provider - this works great. In the internal network, everything is fine. Now I have a remote SIP phone (SPA1001) that connects to Axon through a VPN tunnel (IPSEC). Internal calls work fine. However, calls to external lines fail: they ring, but no voice data. It seems that Axon routes the RTP traffic directly from the external SIP provider to the remote SIP phone, which cannot be reached since the policy for the VPN tunnel does not allow external traffic to go through it. It seems I need some sort of a 'media proxy' or 'session border controller', to make sure the RTP traffic passes Axon. Is there anyway to make Axon work like that? Does the VRS recordings system force Axon to work as a SBC? Thanx for the help.
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