I am a bit desperate trying to solve this problem. Sorry if I am abusing the list a bit with the same king of question.
The problem I am having is very specific which is why it is very difficult to diagnose and fix. Basically an Asterisk server is connected via E1 PRI to an Avaya PBX. The Asterisk server has 45 PAP2T and 45 SPA-3102 devices connected via the Internet. The Asterisk server is behind a Fortinet firewall and has all necessary ports redirected to it. By itself, everything is working. I can make and receive calls to all SIP devices, check voicemail and any other service I configure on the Asterisk server. I have the relevant parts of NAT configured like "externip", localnet, nat=yes and canreinvite=no. The problem only presents itself when a SIP device is trying to call an extension connected to the Avaya. Since "localnet=192.168.2.0/255.255.255.0" is defined and the Fortinet firewall rewrites the source IP as its own "192.168.2.1", I think this may be the cause of my problems but why only when calling the Avaya and not other SIP extensions or Asterisk services? Since the SPA3102 has Symmetric RTP it works fine. The PAP2T on the other hand gives one way audio when you call any extension on the Avaya. The only way I can get the PAP2T to work is to change the localnet to something else then it works properly but the SPA does not. Any call I make from the SPA hangs up after a minute or so and any call I make rings the SPA but I do not get any audio. What is the proper NAT setup for something like this? Is it even possible to work with this type of NAT? Any comment would be truly appreciated. -- Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez Prats Director de Tecnología +52-55-91169161 ext 2001
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