We have following situation. Asterisk as PBX and 2 SPA942 and 1 PAP2 with 2 analog phones connected. All is working prefectly until we added WRP400 to replace PAP2. Analog phones connected to WRP400 are registered on Asterisk. They are ringing on call but no audio on both sides. SPA 942 connected to WRP400 haven't any problem and PAP2 connected to the WRP400 with both analog phones is working perfectly but only voice piece of WRP400 isn't working.
We have checked configuration of voice piece of WRP400 many time and it seems all properly configured. An port forwarding or firewall issue couldn't be because SPA942 and PAP2 connected to the WRP400 are working fine. Firmware upgrade doesn't solved our problem.
Have you any idea what could be the problem? Any help would be appreciated.
P.S. Sorry for my bad english because isn't my mother language.