Ok. Please, note that 192.168.1.37 (I suspect) is the internal LAN address Of the Polycom hardphone. If this is true, then you have NAT issues.
The REGISTER message are received by your PBX, but when respond, Asterisk send the next SIP message to the IP informed by the phone, that is the internal LAN address. The messages do not reach back to the hardphone. You need to setup a STUN server in the Polycom hardphone settings. Please, check the manual. Search in Google some public STUN server to put in the settings. Last, the idea behind the "sip set debug" command was view the complete SIP messages conversation, not search for an error. On NAT escenarios, remember: * The NATed phones need to know the public IP of the NATing router. Either by manual setting or by STUN protocol. * Reduce the time between REGISTERs attempt, if the client have a dynamic IP connection. * Use the "localnet" SIP settings in Asterisk, so the PBX can distingish what Network need contacted via NAT and what not. Cheers.
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